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                     A Thousand Degrees Below Zero

                          By Murray Leinster

           [Transcriber's Note: This etext was produced from
                   The Thrill Book, July 15, 1919.]




CHAPTER I.


From some point far overhead a musical humming became audible. It
was not the rasping roar of an aëroplane motor, but a deep, truly
melodious note that seemed to grow rapidly in volume. The soft-voiced
conversations on the upper deck were hushed. Every one listened to
the strange sound from above. It grew and became clear and distinct.
The source seemed to come nearer. At last the sound came from a spot
directly overhead, then passed over and toward the Narrows.

A cold breeze beat down suddenly. It was not a cool sea breeze, but
a current of air coming down from directly above the Coney Island
steamer. It was actively, actually cold. A chorus of exclamations
arose, full of the wit of the American a-holidaying.

"Br-r-r-r! I feel a draft!"

"Say, Min, are you givin' me the cold shoulder?"

"Sadie, d'you want to borrow all of my coat or only the sleeve?"

And one young man caused a ripple of laughter by remarking:

"Feels like my mother-in-law was around somewhere."

People hastened to put on such wraps as they had with them. On the
lower decks there arose a sound of tired voices, saying with variations
only in the names called:

"Johnnie, button up your coat. It's getting cold."

The cold wave lasted only for a few moments, however. As the steamer
forged ahead the strata of cold air seemed to be left behind, and the
humming sound grew fainter. If the passengers on the boat had listened,
they might have heard a faint splash in the water behind them, but
as it was the sound went unnoticed. The humming died away. The boat
went on and docked, and the passengers dispersed to their homes. Every
one of them woke the next morning to find himself or herself locally
celebrated.

Half an hour after the Coney Island boat had docked a tramp steamer was
nosing her way out of the Narrows. She was traveling at half speed,
the air was clear, the channel was well buoyed, and there seemed no
possibility of any harm or danger befalling her. The lookout leaned
over the bow negligently, watching and listening to the indignant
interchange of whistle signals between two small tugs in a dispute
over the right of way. He dropped his eyes and stiffened, then turned
toward the pilot house and shouted frantically, but too late. The shout
had hardly left his lips before there was a shock and grinding sound,
mingled with the raucous shriek of rent and tormented iron plates.
The tramp steamer shuddered and stopped, and began to sink a trifle
by the head. At the first intimation of danger the man on the bridge
had ordered the water-tight doors, closed, and now he rang for full
speed astern. The tramp swung free of the unknown obstruction, but the
two bow compartments were flooded and the steamer's stern was lifted
until the propeller thrashed helplessly in a useless mixture of air
and water. Her whistle bellowed an appeal for help. "_Want immediate
assistance!_"

Half a dozen tugs, including the two that had been quarreling by
whistle, responded to the stricken steamer's call. Their small sirens
sent cheery messages promising instant aid, and they began to tear
across the water toward her. One tug reached the helpless vessel's
side. A second rushed up and began to pull the unwieldy tramp away
from the unknown obstacle. The lights of a third could be seen very
near, when there was a crash and a frantic bellow from the tug. It also
had struck the obstruction against which the tramp had run. The tramp
bellowed anew.

A destroyer shot down the river with a searchlight unshipped, her crew
standing by to rescue any persons who could be reached by lifeboats.
She swung up and saw the tramp being hauled and pulled at by busy,
puffing tugs. The long pencil of light danced over the surface of the
water to find the derelict or wreck that had caused the trouble. Back
and forth it swept, and then stopped with a jerk as if the operator
could not believe his eyes.

Floating soggily in the water of New York harbor, in late August--the
hottest time of the year--a wide cake of ice lay glistening under the
searchlight rays! The harbor waves ran up to the edge of the ice cake
and stopped. Beyond their stopping point the surface was still and
glassy. The cake floated heavily in the water and showed no sign of
cracks or fissures. It was evidently of considerable thickness.

A second searchlight reënforced the first. The two white beams moved
back and forth, incredulously examining the expanse of ice. It was
hundreds of yards across. At last one of the beams passed something
at the center of the cake and hastily returned to the thing it had
seen. Rising calmly and quietly from what seemed to be a small crater
at the center of the ice cake, a plume of steam floated placidly into
the air. It was a huge plume, precisely like the flowing of a white
ostrich feather, rising from a small orifice in the center of the mass
of frozen sea water.

A wail from the siren of the tug that had run against the ice cake
caused the searchlights to turn in its direction. The engine had ceased
to run and a cloud of escaping steam was pouring from the tug's funnel.
Men on the deck gesticulated frantically. The destroyer ran as close
as the commander dared, and he shouted through a mega-phone. It was
impossible to distinguish words in the confused shouts that came back
from half a dozen throats at once, but the searchlights soon showed the
cause of the excitement. The men on the tug pointed over the side. The
small harbor waves rolled unconcernedly up to a point some twenty feet
from the stern of the tug, but there they stopped abruptly. The tug had
become inclosed in the ice floe. As those on the destroyer watched,
the twenty feet became thirty and the thirty forty. The ice cake was
increasing in size with amazing rapidity.

A boat put off from the destroyer, and the commander shouted to the
crew of the tug to take to the ice. There was a moment's hesitation,
and then they jumped over the side and ran to the edge of the floe.
The lifeboat touched the edge and was instantly frozen fast, but
the sailors managed to break it free again by herculean efforts. It
went back to the destroyer, whose wireless almost instantly began to
crackle. Two other destroyers dashed down from the Brooklyn Navy Yard
and turned their searchlights on the strange visitor in the harbor.
The semaphore of the first destroyer on the scene began to flash, and
the three lean naval craft began to circle around the huge ice cake,
warning away all other craft and constantly measuring and re-measuring
the size of the mass of ice. One of the destroyers at last slipped
outside the Narrows and stayed there, patrolling back and forth to keep
other vessels from running foul of the strange and as yet inexplicable
phenomenon.

By daybreak the Battery was a black mass of people. They looked eagerly
toward the Narrows, but could see nothing but a wall of mist, from
which the gray shape of a destroyer now and then emerged. High in the
air, however, the plume of steam was visible. It was now more than a
thousand feet high and was dense and white. The first rays of the sun
had gilded the top, while the ground below was still dim and dark,
but now it rose in calm and quietness to an unprecedented height,
mystifying the people who looked at it and causing a sudden silence
to fall upon them all. A warm, moist sea breeze had blown in from the
ocean during the night and had been changed to fog as it passed over
the expanse of ice, so that the ice itself was hidden from view, but
the tall plume of steam told of some mysterious menace to humanity that
the crowd assembled at the Battery feared without understanding.

As the mass of people watched the supremely calm column of steam rising
high in the air of that August morning, newsboys began to circulate
among them, their strident cries sounding strangely among the silent
multitude. The Narrows were frozen solidly from shore to shore, and all
entrance to and egress from New York harbor was blocked. Small craft
could go out behind Staten Island through the Kill van Kull, and some
vessels could use the other channel which goes from the East River into
the Sound, but the great Ambrose Channel---one-third the size of the
Panama Canal--and the broad opening that made New York the greatest
port on the Atlantic coast was closed. The growth of the ice cake had
greatly lessened, so that it could be predicted that it would not
expand far beyond its present size, but its origin and the means by
which it resisted the disintegrating effect of the August warmth were
utterly unknown. The cause of the plume of steam from the center of the
ice cake was an unfathomable mystery.

Suddenly, from the empty sky, there came a deep, musical humming.
Instinctively people looked up. The humming grew louder and more
distinct, while curious eyes swept the sky.

Then a black speck appeared below one of the fleecy white clouds and
dropped toward the earth. A thousand feet, two thousand feet it fell,
then checked and hung steadily in the air. Those who looked with the
naked eye could only discern that it seemed like a wingless black
splinter suspended above the earth, but those who had glasses saw the
whir of dark disks above a black, stream-lined body. A small cabin
was placed amidships, and a misshapen globe hung from chains below.
It was still for several minutes. The passenger or passengers seemed
to be inspecting the earth below, and particularly the ice cake, with
deliberation and care. Then it began to rise with the same deliberation
and certainty, swung around, and sped off with incredible speed toward
the northeast. The humming sound grew fainter and died away, but the
crowd standing on the Battery began to murmur with a nameless sense of
fear.




CHAPTER II.


New York was frightened, and the newspapers as they appeared did not
allay that fear. The conservative _Tribunal_ ran a scare head: HAS
THE GLACIAL AGE COME AGAIN? and printed underneath a résumé of the
phenomena up to the time of going to press--which did not include the
appearance of the black flyer--with an interview from a prominent
scientist. An enterprising reporter had routed the worthy gentleman out
of bed and rushed him to the scene of the expanding ice cake in a fast
motor boat, taking down in shorthand his comments on the matter. The
scientist had been much puzzled, but spoke at length nevertheless. He
said in part:

    Has the glacial age come again? I do not know. I can only say that
    we have no certain knowledge of the original cause of the glacial
    period  and we cannot say definitely that it did not begin in
    precisely this fashion. We have volcanos which radiate incredible
    quantities of heat to the country surrounding them. No phenomenon
    like this has occurred before, but it may be that some unknown
    cause may bring to the surface a condition the antithesis of a
    volcano, which, instead of radiating heat, will bring on local
    glacierlike conditions. One might go farther and suggest that the
    earth may alternate between periods of volcanic activity, during
    which it is warm and conditions are favorable for habitation and
    growth, and periods of this new antivolcanic activity during which
    frigidity is normal, and mankind may be forced to take refuge in
    the tropic zones. Still, I cannot say definitely.

The eminent scientist went on for two full columns, during which he
refused to say anything definite, but suggested so many alarming
possibilities that every one who read the _Tribunal_ was thrown into
a state of mind not far from panic. He offered no explanation of the
plume of steam.

When the appearance of the black flyer became known in the newspaper
offices, city editors threw up their hands. The less conservative
printed the wildest explanations. They put forth a virulent-organism
theory, which, it must be admitted, was no farther from the truth
than most of the others. The story began with an interview with the
boatswain in charge of the boat crew from the destroyer:

    We were ordered to take the men off the ice and to take especial
    care not to be nipped ourselves. We rowed carefully toward the edge
    of the ice cake, with the light of the searchlights to guide us. We
    would see where the floe began, when the waves dropped back from
    it. I've been in Northern seas, but I never saw anything like that.
    The edge of the ice wasn't smooth and worn away by the waves. It
    was rough with frost crystals that reached out like fingers
    grabbing at the things near by. When we came close to the edge some
    of the men in my boat were scared, and I don't blame them. I'd
    dipped my hand overboard and the water was warm--and twenty feet
    away there was that mass of ice! We backed up to the ice cake and
    took off the men. I was looking over the side of the life boat, and
    saw those long crystals forming and growing while I watched. They
    were huge, from two feet long for the largest to three or four
    inches for the smallest. They reached out and reached out terribly.
    The stern of the boat was touching the ice, and I saw them reaching
    for the hull like the tentacles of an octopus. They fastened on and
    began to grow thicker. We took oars and smashed them, feeling
    frightened as one is frightened in a nightmare. As fast as we broke
    them they formed again, and the men on the ice seemed to be rotten
    slow getting into the boat, though I don't doubt but they were
    hurrying all they knew how. When they were all aboard we had to
    work like mad to get clear.

The paper went on to expound its own idea of what had happened:

    The sinister growth of the ice crystals is significant There has
    always been notice of and comment upon the striking similarity
    between the growth of crystals and the growth of plants. Until now
    all scientific text-books have said that crystals could only grow
    in a supersaturate solution of their own substance, and claimed
    that they were not organic growths--in the sense of growths caused
    by an intelligence within the crystal. Is it not possible that the
    scientists have been wrong? Is it not possible that crystals are
    growths in the same way that plants are growths? Granting that, what
    is to keep a scientist from isolating and cultivating the crystal
    embryo? We have done that with germs, and with the life germs in
    eggs and plants. We can even use a process of parthenogenesis and
    create monsters from the unfertilized eggs of frogs and sea urchins.
    Why could not this scientist experiment until the life germ of the
    ice crystal could be developed and enlarged? Why could not this
    development continue until the germ could not only create its
    crystals under the most favorable conditions of temperature, but
    _at the normal temperature of water_? At the Harvard laboratories
    water has been, kept liquid far below its normal freezing-point,
    and under tremendous pressure has been found to remain ice at a
    temperature of one hundred degrees Fahrenheit! Can we doubt that
    this appearance of ice at this extraordinary season is due to the
    malicious activities of a foreign government, envious of our
    magnificent merchant marine and commerce?

The explanation was ingenious, but though the scientific facts quoted
were quite correct the inference was hardly justifiable. Water can
and does reach a temperature several degrees below 32° Fahrenheit
without solidifying--as may be proved by putting a glass of water in
a cold room in winter--but the slightest jar causes the instantaneous
formation of ice crystals, and in a little while the whole mass is
solid. The fact of "hot" ice must also be admitted, but it requires
a pressure of rather more than fifty tons to the square inch, and is
rarely attempted.

This paper also was forced to admit as inexplicable the plume of steam
which rose from a thousand to fifteen hundred feet into the air. In
any event, the claim that a certain unfriendly foreign government
was trying to ruin the commerce of the United States was effectively
squashed by cablegrams from Gibraltar, Folkestone, and Yokohama. Three
great icebergs had formed in the Straits of Gibraltar and extended
until they joined, when a solid mass of ice made a bridge that once
more rejoined the continents of Africa and Europe, from Ceuta to the
Rock. The plumes of steam were visible here, too. Three mighty columns
of white mist rose at equal distances across the gap.

Folkestone harbor was a mass of ice. A great transatlantic liner
had been caught in the expanding berg, and the huge hull had been
crushed like so much cardboard. The passengers and crew had escaped
across the ice. The great steam plume made a wonderful sight for miles
around. Yokohama was similarly visited. Three battleships of the
Japanese fleet were frozen in and their hulls cracked and broken. The
plume of steam--nearly two thousand feet high--had aroused the latent
superstition of the Japanese and was being exorcised in every Shinto
temple in the kingdom.

The panic which was engendered by the mysteries of the icebergs and
the unknown motives of the men so obviously responsible for their
appearance grew in intensity. New York was in a blue funk. The police
felt the tremor that means that at any moment the crowds thronging the
streets might break and from sheer panic become uncontrollable. Every
patrolman wore a worried frown and worked like mad to keep the crowds
moving, moving always. The strain was becoming greater, however, and
troops were being hastily moved into the city when an announcement was
made by the British foreign office:

    It has been decided to make public a communication received at the
    foreign office bearing on the blocking of Folkestone harbor, the
    Straits of Gibraltar, Yokohama, and New York. The communication is
    dated from "The Dictatorial Residence," and reads as follows:

    "TO THE PREMIER OF GREAT BRITAIN: You are informed that the
    blocking of Folkestone harbor, as well as that of the Straits of
    Gibraltar, New York, and Yokohama, is evidence of my intention and
    power to assume control of the governments of the world as dictator.
    Present administrations and systems of government will continue in
    power under my direction and subject to my commands. The machinery
    of the League of Nations is to be used to enforce my decrees. You
    will readily understand that the same means I used to block the
    harbors and straits now frozen over can be extended indefinitely.
    Rivers can be made to cease to flow, lakes to irrigate, and all
    commerce and agriculture forced to suspend its activity. This will
    be done, if it is made necessary by the refusal of the governments
    of the world to accede to my demands. Given under my hand at the
    dictatorial residence,

    "(Signed) WLADISLAW VARRHUS."

    The foreign office offers this communication to allay the fears of
    the public that a new glacial period may be imminent, but at the
    same time it wishes to assure the British people that the demands
    of the writer are not taken seriously. It is evident that the maker
    of such absurd demands is insane, and though he may be able to
    cause perhaps serious inconvenience to commerce, a means of
    nullifying his invention will be forthcoming in a short while.
    British scientists are studying the Folkestone phenomena and are
    confident of a prompt solution of the problem.

Though it might have been expected that such an announcement as that
of the intention of an unknown and probably insane man to make himself
ruler of the world would have caused even greater panic, the reverse
was actually the case. The motive behind the creation of the icebergs
was made so clear that the world settled back with a sort of sporting
interest to see what would happen. It had not long to wait.

A hint came by some underground channel that Professor Hawkins
had offered a suggestion to the American government that had been
accepted as a basis for experiment. A reporter went post-haste to the
professor's home. He was admitted, but the professor would not see him
at the moment. The reporter sat down patiently to wait. A motor car
drove up to the house and a man in soldier's uniform stepped out. The
reporter gave a whistle. A second car discharged a quietly dressed man
in civilian clothes attended by two other army officers. The reporter
stared. He recognized the men. Most people on two continents would
have recognized them. They passed through the house to the professor's
laboratory at the rear. A long time passed. The reporter fidgeted
nervously. Some conference of colossal importance was taking place
back there in the laboratory.

It was an hour later that the visitors left. With them went a young man
the reporter had not seen before. The professor came slowly into the
room and smiled apologetically.

"I am very sorry to have kept you waiting, but it was necessary. I
think that in about two hours I will have some news for you. In the
meantime there is nothing more to say."

"Can you tell me what really happened? How did this Varrhus make the
berg?"

"It's the simplest thing in the world," said the professor with a
smile. "I've managed to duplicate it on a small scale back in my
laboratory. Suppose you come back there and I'll show you."

A girl appeared in the doorway with a worried frown on her face.

"Father, has Teddy gone?"

"Yes. We'll hear in about two hours." The professor turned to the
reporter with instinctive courtesy. "This is my daughter, Evelyn."

The girl shook hands.

"You want to know about the iceberg, too? Teddy has gone to break it up
now."

"To try to break it up," corrected the professor with a smile. "'Teddy'
is my assistant."

"But how?" insisted the reporter. "You seem to be so confident, and
every one else does nothing but guess."

"I'll show you quite clearly," the professor said gently, "if you'll
come back to the laboratory."

They moved toward the rear of the house. A hullabaloo of whistles broke
out in the harbor. The girl turned toward the professor.

"Teddy already?"

The professor frowned.

"He hasn't had time." He went to a window and looked out, inspecting
the sky keenly. A slender black splinter hung suspended in the air.
The professor flung open the window, and a musical humming filled the
room. As they watched a smoking object detached itself from the black
flyer and fell downward.

"That must be Varrhus," said the professor.

A winged flyer with the insignia of the American aviation corps painted
on the under surface of its wings darted into their field of vision.
Black smoke trailed behind it as it shot toward the sinister black
craft. There was an instant's pause, and then little puffs of white
mist appeared before the propeller of the aëroplane.

"He's firing his machine gun!" said the reporter excitedly.

As he spoke the black flyer dropped like a stone, and the American
plane shot above it. Almost instantly the black flyer checked in
mid-air and rose vertically with amazing speed. The American plane
drove on for a second, and then wavered. It began to climb, stalled,
and dropped toward the earth in a series of side slips and maple-leaf
turns. It came down erratically, crazily.

"Killed!" said the professor with compressed lips.

His daughter uttered a cry:

"And Varrhus is getting away!"

The black flyer had become but the merest speck. It had attained an
almost unbelievable height. Now it deliberately swung around and headed
off toward the northeast with its same incredible speed.




CHAPTER III.


Teddy Gerrod was stuffing his feet into heavy, fur-lined arctic boots.
Ten or twelve soldiers were loading clumsy, awkward-looking engines
on improvised sledges resting on the ice at the foot of the fort
embankments. Others were putting equally ungainly iron globes with
winged metal rods attached to them on other sledges. A dozen befurred
and swathed figures came down the slope of the embankment and examined
the preparations. A naval launch ran smartly alongside the edge of the
ice, and a messenger came over at the double to the commandant of the
fort, who stood by Teddy Gerrod. The messenger saluted.

"Sir, the object dropped from the black flyer was a tin float having a
message attached. The smoke was from a smoke fuse, lighted to attract
attention."

He handed over the letter, saluted again, and retired. The commandant
tore open the letter and read it through, then swore frankly.

"A threat to freeze the Croton reservoir and cut off New York City's
water supply if an answer to his previous demands is not given within
forty-eight hours! And he can do it! Mr. Gerrod, you've simply got to
settle this business. New York would go crazy if the people knew this.
There'd be no way to supply the water the city has to have. And seven
million people without water----"

Teddy smiled grimly.

"I'm going to try. Professor Hawkins is usually right, and we ought to
be able to do something about this berg."

A second messenger came up and saluted.

"Sir, Lieutenant Davis reports that the plane has been recovered and
Lieutenant Curtiss' body examined. There are no bullet marks, and the
body seemed to be frozen solidly. He cannot say, as yet, what caused
Lieutenant Curtiss' death."

"Frozen," said Teddy laconically.

"In mid-air?" asked the commandant sharply. "And in a fraction of a
second, wearing heavy aviator's clothing?"

Teddy nodded, and buttoned up the huge fur coat in which he was
enveloped.

"I'm ready to start off now, if the sledges are."

The little party moved away from the shore. The heavy mist still hung
over the expanse of ice, but near the shore the ice was thinner. The
sledges were roped together, and Teddy walked at the head. The party
tugged at the ropes on the sledges, puffing out clouds of frosty breath
at every exhalation. Teddy had taken the compass bearings of the steam
plume, and after he had gone a hundred yards from the shore the wisdom
of his course became apparent. They were completely surrounded by a
thick fog in which objects five yards off were lost to view. Teddy,
leading the small column, could not be seen except as a dim and shadowy
figure by the men hardly more than two paces in his rear. He referred
constantly to his compass, and once or twice glanced at the thermometer
he had strapped on the sleeve of his great coat.

"Forty degrees," he murmured to himself. "And in New York it's
eighty-four in the shade. The ice must be colder still because it's dry
and hard."

The party toiled on. Presently small snow crystals crunched underfoot.

"Frozen mist," said Teddy, and glanced at his thermometer. "H'm!
Twenty-two degrees. Ten below freezing."

The party stopped for a breathing spell.

"I hope you men smoke," said Teddy, "because it's going to be cold a
few hundred yards farther on. We'll come clear of this mist presently.
If you smoke, and inhale, it'll probably warm up your lungs a little.
You don't need it yet, though. Any of you who haven't pulled down the
flaps of your helmets had better do so now."

A moment or so later they took up their march again. The sledges,
with their heavy loads, were cumbersome things to drag over the
uneven surface of the ice. The men panted and gasped as they threw
their weight on the ropes. Teddy felt the air growing colder still,
and presently noticed that the mist no longer seemed to be as thick
as before. He glanced down at the front of his heavy fur coat. It
was covered with tiny white crystals. He held up his hand with the
thick mitten on it to form a dark background, and saw numberless
infinitesimal snowflakes drifting slowly toward the ice under his feet.
His thermometer showed two degrees above zero--and New York, six miles
away, was sweltering in August heat!

"Not much farther," he called cheerfully. "We're almost there."

They panted and tugged on, a hundred and fifty yards more. Then they
stopped and stared.

Three hundred yards away the great column of steam was issuing from the
ice. A hollow hillock of snow and ice rose to a height of twenty feet,
like the miniature crater of a volcano. From it, in an unbroken stream,
the mass of steam emerged with a roaring, rushing sound. It rose five
hundred feet before it broke into the plumelike formation that was so
characteristic. There was a space, perhaps six hundred paces across,
in which there was no mist. The cold was too intense to allow of the
formation of fog. Water vapor condensed instantly in that frigid
atmosphere. But around the clearing the mist rose from the surface of
the ice. It became noticeable when it was merely waist-high, then rose
to the height of a man, and climbed to a height of fifty feet in a
circular wall all about the strange white open space. Teddy, looking at
the top of the wall of vapor, saw that it undulated gently, as if waves
were flowing back and forth around the tall column of steam.

The men began to unload their sledges. The awkward little trench
mortars were set in place and careful measurements made of the
distance to the steam plume. While the men labored, Teddy moved forward
toward the central cone. Five degrees below zero, fifteen degrees below
zero, thirty degrees below zero----His breath cut sharply when it went
into his lungs. Teddy put his mittened hand over his nose and face to
partially warm the air before he breathed it in. Now, even through the
heavy, arctic clothing he wore, he felt the bitter cold. He detached
the thermometer from his sleeve and clumsily tied it to a cord. He
had hoped to be able to lower it down the rim of the crater, but that
was impossible. He flung it toward the hillock of snow and ice, let
it remain there an instant, then hastily drew it back to read it. The
ether in the thermometer had frozen into a solid mass in the bulb of
the instrument.

Teddy went back to where the men had made ready. Four of the wicked
little guns would fling their three-hundred-pound bombs into the center
of the column of steam. If all went well, at least one charge of T.N.T.
would explode far down the orifice.

The propelling charges had been inserted, and now the slender rods were
put into the muzzles of the short, squat weapons. The winged bombs were
balanced on the muzzles like top-heavy oranges on as many sticks. At
half-second intervals, the four guns went off one after the other.

Before the last had exploded, or just as the flame leaped from its
muzzle, the hillock of ice rose as in an eruption. Four cracking
detonations blended into one colossal roar that half stunned the little
fur-clad party. The rush of air threw them from their feet. When
they rose again a huge hole showed in the center of the clearing, a
gaping chasm that went down deep into the heart of the ice. A cloud of
yellowish smoke floated above them. And the column of steam had ceased!
Only a few stray wisps of white vapor floated up from the opening.

"It's done!"

Teddy gave orders for a quick return to the fort. The mortars could be
returned for. At the moment the important thing was to send the news to
England and Japan.

The return trip was made quickly, and Teddy made hurried explanations
to the commandant of the forts of what should be done. Men should
bore deep holes twenty feet apart, the holes to be along the edges of
clearly defined sections of the ice. Simultaneous blasts should be set
off, and the sections would float free. The iceberg would not grow
again. It was done for.

Cablegrams were prepared and rushed through to Folkestone, Yokohama,
and Gibraltar. If men took trench mortars and fired shells that would
fall down the holes from which the steam issued, the cause of the ice
cakes would be destroyed and the ice itself could be blasted off and
towed out to sea to melt.

Teddy rushed back to the professor's home to report to him the full
verification of his theories, and it was there and then that the first
authentic explanation of the ice floe was given to the world. Word of
his effort and of the disappearance of the steam plume had preceded
him, and as he sped uptown in the taxicab newsboys were already on
the streets with their extras. Only the front pages--showing signs of
having hastily been hacked to pieces to make room for the story--had
anything about the latest development, and those extras are singularly
perfect reflections of the public attitude at that time.




CHAPTER IV.


Teddy threw himself out of the machine and rushed up the steps. Evelyn
opened the door before he could ring, and his beaming face told her
the news he had to give even without his enthusiastic, "It worked!"

"The steam plume has stopped?" asked the professor anxiously.

"Absolutely," said Teddy cheerfully. "Not a sign of steam except from
two or three puddles of hot water that were cooling off when we left to
get back to the fort. The commandant was setting his men to work with
the navy-yard men when I started here."

"Tell me about this, won't you?" said the reporter briskly. "I'll catch
the devil from the city editor for missing out on that part of it, but
if you'll give me the full story----"

"What's your paper?"

The reporter told him.

"That's all right," said Teddy easily. "They were calling extras of
that paper as I came uptown. The professor has told you the theory of
the thing?"

"No," said Evelyn. "He was starting to, but the black flyer appeared
and shot down the other aëroplane, and father was so much upset that he
couldn't go into details. Was the pilot of the aëroplane killed?"

Teddy nodded.

"Frozen, poor chap. He never knew what struck him."

"What did happen?" asked the reporter again. "You people seem to take
this so much as a matter of course, and no one else can do anything but
guess."

"The professor knows more about low temperatures than any other man
in the world," explained Teddy. "It's only natural that he should be
fairly certain of his facts."

He smiled at the professor as the old man made a deprecating gesture.

"Father is much upset," said Evelyn. "I think it would be best if Teddy
explained. Will that be all right?"

"Only, in your account of the matter," said Teddy decidedly, "the
professor must be given credit for the whole thing. It's his work, and
he's entitled to it."

"No, no," protested the professor. "Teddy did a great deal."

Evelyn pressed his arm, and he obediently was quiet. The two young
people smiled at him.

"You see how I am ruled," said the professor in mock tragedy. "My
daughter----"

"Is going to see that you rest a while," said Evelyn, with a twinkle
in her eyes. "Teddy, you go and explain the whole thing while I take
father out and discipline him."

With a laugh, she led the old man away. Teddy smiled.

"We aren't accustomed to reporters," he said, "or I suspect we'd act
differently. Miss Hawkins is a most capable physicist, and helps her
father immensely. The three of us work together so much that----Well,
come along to the laboratory."

The two went to the rear of the house. On the way they passed through
a long room full of glass cabinets in which odd bits of metal work
glittered brightly.

"The professor's hobby," said Teddy, with a nod toward the cases.
"Antique jewelry and ancient metal work. He's probably better informed
on low temperatures than any one else I know of, but I really believe
he's as much of an authority on that, too. This is Phoenician, and
that's early Greek. These are Egyptian in this case. This way."

He opened a small door and they were in the laboratory.

"I'm afraid I'll have to lecture a bit," said Teddy. "Here's how the
professor used to work out what was taking place out in the harbor."

He showed an intricate combination of silvered globes, tubes, and half
a dozen thermometers.

"You see," Teddy began, "the water in the harbor was at a certain
temperature. At this time of the year it would be around 52°
Fahrenheit. The professor knew that fact, and then the fact that a huge
mass of it was turned into ice. When you turn water into ice you have
to take a lot of heat out of it, and that heat has to go somewhere.
When water freezes normally in winter that heat goes into the air,
which is cold. In this case the air was considerably warmer than the
ice, and was as a matter of fact, undoubtedly radiating heat into the
ice, instead of taking it away. The heat that would have to be taken
from say ten pounds of water at 52° to make it freeze, if put into
another smaller quantity of water would turn the smaller quantity of
water into steam. You see?"

"The steam plume!" exclaimed the reporter.

"Of course," said Teddy. "We measure heat by calories usually. That's
the amount of heat required to raise a pound of water one degree
Fahrenheit. Suppose you have a mass of water. To make it freeze you
have to take twenty thousand calories of heat out of it. Suppose you
take that heat out. You've got to do something with it. Suppose you put
it into another smaller mass of water. It will make that second mass of
water hot, so hot that it will turn into steam at a high temperature."

"Then Varrhus," said the reporter thoughtfully, "was taking the heat
from a big bunch of water and putting it into a small bunch, and the
small bunch went up in steam. Is that right?"

"Precisely." Teddy turned to a file on which hung a number of sheets
of paper covered with figures. "Here are the professor's calculations.
We could only figure approximately, but we knew the size and depth
of the ice cake, very nearly the temperature of the water that had
been frozen, and naturally it was not hard to estimate the number of
calories that had had to be taken out of the harbor water to make
the ice cake. To check up, we figured out how much water that number
of calories would turn into steam. The professor appealed to the
government scientists who had watched the cake from the first. He found
that from the size of the plume and the other means of checking its
volume, he had come within ten per cent of calculating the amount of
water that had actually poured out in the shape of steam."

"But--but that's amazing!" said the reporter.

"It was good work," Teddy said in some satisfaction. "Then we knew
what Varrhus had done, and it remained to find out how he'd done it.
Nothing like that had ever happened before. He couldn't very well
have an engine working there in the water. The professor took to his
mathematics again. Assume that I have a stove here that will make it
just so warm at a distance of five feet. I'm leaving warm air out of
consideration now and only thinking of radiated heat. If I put my
thermometer ten feet away how much heat will I get?"

"Half as much?" asked the reporter.

"One-quarter as much," said Teddy. "Or three times away I'll get
one-ninth as much, or four times away I'll get one-sixteenth as much.
You see? If I want to make the ends of an iron bar hot, and I can only
heat the middle, the middle has to be red-hot or white-hot to make the
ends even warm. If I have to make the middle of a bar red-hot to have
the ends warm, you see in order to make the ends cold the middle would
have to be very cold indeed."

"Y-yes, I understand."

"Well, the professor worked on that principle. He knew the temperature
of the edges, and he knew the size of the ice cake. It was easy to
figure what the temperature must be in the middle. It worked out to
within two degrees of absolute zero!"

"What's that?"

"There isn't any limit to high temperatures. You can go up two thousand
degrees, three thousand, four, or five. Some things almost certainly
produce a temperature of as much as eight thousand degrees. But high
temperatures are produced by putting more heat in--by stuffing the
thing with calories. I make an iron bar red-hot by putting calories in.
I make it cold by taking calories out."

"Well?"

"If you keep that up you reach the point where there aren't any more
calories left to take out. When you get to that point you have a
temperature of 425° Centigrade, or one thousand and seventy-eight
degrees Fahrenheit below zero. That's absolute zero."

Teddy spoke quite casually, but the reporter blinked.

"Rather chilly, then."

"Rather," Teddy agreed. "But our calculations told us that Varrhus had
reached and was using a temperature within two degrees of that in the
center of his ice cake. And right next to that temperature he had a
very high one, as evidenced by the plume of steam."

"I can't see how you got anywhere," said the reporter hopelessly. "I'm
all mixed up."

"It's very simple," said Teddy cheerfully. "On one side of a wall the
man had what amounted to a thousand and some odd degrees below zero. On
the other he had probably as much above zero. Evelyn--Miss Hawkins, you
know--made the suggestion that solved the problem. She showed us this."

Teddy picked up what seemed to be a square bit of opaque glass.

"Smoked glass?"

"Yes, and no." Teddy smiled. "You can't see through it, can you?"

"No."

"Come around to this side and look."

The reporter made an exclamation of astonishment.

"It's clear glass!"

"It's a piece of glass on which a thin film of platinum has been
deposited. It lets light through in one direction, but not in the
other. Evelyn suggested that Varrhus had something which did the same
thing with heat. It would let heat through in one direction, but not in
the other. Of course if it would take all the heat from the air on one
side and wouldn't let any come back from the other----"

"It would be cold?"

"On one side. The glass looks black because it lets the light go
through and lets none come back. The surface, we have assumed, would be
almost infinitely cold because it would let heat go through and would
let none come back. We decided that Varrhus had made a hollow bomb of
some shape or other, composed of this hypothetical material. Heat from
the outside would be radiated into the interior because the surface
absorbed heat like this glass absorbs light. It would act as a surface
at more than a thousand below zero. Because something had to be done
with the heat that would come in, Varrhus made the bomb hollow and left
two openings in it. The inside of the bomb is intensely hot from the
heat that has been taken out of the surrounding water. The hole at the
bottom radiates a beam of heat straight downward which melts a very
small quantity of ice and lets the water flow into the bomb, where it
is turned into steam. Naturally, it flows out of the other hole at the
top. There you have the whole thing."

"And you stopped it----"

"By dropping a T. N. T. bomb down the steam shaft. It went off and blew
the cold bomb to bits. The iceberg will break up and melt now."

The reporter stood up.

"I'd like to thank you for this, but it's too big," he said
feverishly. "Man, just wait till I wave this before the city editor's
eyes!" He rushed out of the house.

The newspapers that afternoon had frantic headlines announcing the
destruction of the steam plume and the fact that noticeable signs
of melting had begun to show themselves on the ice cake. Smaller
captions told of the dynamiting that had begun and of the destruction
of the Yokohama and Folkestone bergs by soldiers acting on cabled
instructions. The Straits of Gibraltar were cleared by salvos fired
from the heavy guns on the Rock at the three great plumes of steam.
The world congratulated itself on the speedy nullification of the
menace to its democratic governments. It did not neglect, however,
to rush detachments of men with trench mortars and hand bombs to its
reservoirs, prepared to destroy any possible cold bombs on their first
appearance. The aviation forces, too, made themselves ready to fight
the black flyer on its next appearance, despite the mysterious means by
which it had killed the American pilot.

This state of affairs lasted for possibly a week, when, within three
hours of each other, the papers found two occasions to issue extras.
The first extra announced the death by heart failure of Professor
Hawkins, who had been found by his daughter, dead in his laboratory,
holding in his hands an antique silver bracelet he had just opened at
the clasp. The second, three hours later, announced the formation of an
ice cake in the Narrows which grew in size even more rapidly than the
original one, and was entirely unattended by the steam plume which gave
Teddy Gerrod an opportunity to destroy the first. Within three hours
the Narrows were closed, and the ice floe was creeping up toward New
York.

In rapid succession came the news that Norfolk harbor was frozen
over and Hampton Roads closed, that Charleston was blocked, then
Jacksonville. The next morning delayed cablegrams declared that the
Panama Canal was a mass of ice, and almost simultaneously the Straits
of Gibraltar were again admitted to be firmly locked.




CHAPTER V.


Teddy put his hand comfortingly on Evelyn's shoulder.

"There isn't anything I can say, Evelyn," he said awkwardly, "except
that I couldn't have loved him more if he'd been my own father, and it
hurts me terribly to have him go like this."

Evelyn looked up.

"Teddy," she said bravely, trying to hold back her sobs, "I've been
fearing this for a long time, but--I can't believe it wasn't caused by
that fearful Varrhus."

"The professor did work very hard over that problem," admitted Teddy.

"I don't mean that the work he did caused his heart to fail. I mean I
think Varrhus killed father." Evelyn's eyes were dark and troubled as
she looked at Teddy Gerrod.

"But, Evelyn, why do you think such a thing? You knew his heart was
weak."

Tears came again into Evelyn's eyes, but she forced them back
determinedly.

"Will you go upstairs and look at his fingers--inside? I was--crossing
his hands--on his breast. Please look."

Teddy went soberly up the stairs to where the professor lay quietly on
the bed he was occupying for the last time. Teddy turned back the sheet
that covered the figure and looked at the gentle old face. A lump came
in his throat, and he hastily turned his eyes away. He lifted the sheet
until the professor's thin hands came into view. He looked, at the
fingers, then lifted one of the white hands and examined the inside.
Small but deep burns disfigured the finger tips. When Teddy went
down-stairs his face was white and set, and a great anger burned in him.

"You are right, Evelyn," he said grimly. "Where is the bracelet he was
holding when he was found?"

"On the acids table. He was lying beside it when--when I saw him."
Evelyn was grief-stricken, but she forced herself to be calm. "Do you
think you know what happened?"

"I'm not sure."

Teddy went quietly into the laboratory and found the massive silver
bracelet lying where Evelyn had said. He looked at it carefully before
he touched it, and when he lifted it it was in a pair of wooden tongs.

"That thermo-couple, Evelyn, please. And start the small generator,
won't you?"

The two worked on the bracelet for half an hour, then stopped and
stared at each other, their suspicions confirmed.

"Varrhus," said Teddy slowly. "Varrhus caused your father's death. This
earth has gotten too small for both Varrhus and me to live on."

"He knew father could wreck his plans," Evelyn said in a hard voice,
"and he wished to rule the world. So he killed my father."

Teddy's lips were compressed.

"Before God," he burst out, "before God, I'm going to kill Varrhus!"

The bell rang, and in a moment the commandant of the forts was ushered
in.

"Mr. Gerrod, Miss Hawkins," he nodded to them, and then said: "They
tell me Professor Hawkins is dead. The Narrows are frozen over again.
Hampton Roads is frozen over. Charleston is frozen over. The Panama
Canal is frozen over! There's no steam plume to blow up. Washington
is worried. They're calling me to clear out the channel. The navy
department is going crazy. If it were a case of fighting men I'd know
something, but I can't fight a chemical combination. What's to be done,
since the professor is dead? Who on earth can fill his place?"

He looked from one to the other, already beginning to show the strain
under which he was laboring.

"Professor Hawkins," said Teddy quietly, "was murdered by Varrhus some
four hours ago."

"Murdered! Varrhus has been here!"

"No, Varrhus has not been here, but we may be able to trace him. I'll
get the police. Then we'll talk about ice floes. We know Varrhus'
method now. We'll soon be able to anticipate him."

"But in the meantime," the commandant snapped angrily, "he'll play the
devil with the world."

"We'll play the devil with him when he is caught," said Teddy evenly.
"I've no intention of letting Varrhus get away. Just now there's a
possibility of catching him in the ordinary way. He mailed a present to
the professor, an antique bracelet. Ancient jewelry was the professor's
hobby. He examined the bracelet and died.

"I heard he was dead," said the commandant restlessly. "The paper said
heart failure."

"So did the doctor." Teddy took down the receiver of the telephone.
"Give me police emergency, please."

In a few moments he hung up again. The statement that Professor Hawkins
had been murdered and that there was a chance of catching Varrhus
was all he needed to say. Hardly five minutes had passed before the
commissioner of police himself was in the room with two of his keenest
men.

"You'll have to explain what happened," he said at once to Teddy. "When
news of the professor's death came I phoned at once to the doctor
mentioned in the paper and asked if there were any possibility of foul
play. To tell the truth, I'd been rather afraid something like this
might happen. What was it?"

"Varrhus electrocuted the professor by an antique bracelet."

He handed over the ornament. The commissioner examined it gingerly.

"Nothing funny about this except the workmanship."

"And the surface," said Teddy. His set calm was surprising himself. "It
looks as if it had been lacquered. That's Varrhus' secret."

"What is it? A powerful battery?"

Teddy turned to the materials with which he and Evelyn had been working.

"I'll show you. Here's an instrument that measures the resistance of
a given coil. This is one of the professor's evaporation machines
for producing low temperatures quickly. He evaporates ether in this
sheath that surrounds this oven and objects in the oven are cooled far
below freezing point. Look at this coil of silver wire. We measure
the resistance at room temperature. One hundred and twenty ohms. It
is very fine wire. We put it in the cooling oven and set the engines
going----" For some minutes there was silence while the small electric
pump thumped and rattled. "Now we'll take the coil out. The thermometer
inside the oven says twelve below zero." Teddy handled the small coil
of silver wire with thick gloves. "We'll measure the resistance again.
Fourteen and a half ohms resistance, approximately. Low temperatures
decrease resistance and increase the conductivity of metals. You see?"

"Yes, but why----"

"The inside of that bracelet is nine hundred degrees below zero. The
whole thing is coated with Varrhus' lacquer, which, in this case,
radiates all the heat from the inside out, leaving it incredibly cold
within. That cold makes the silver conduct electricity better."

"Well?"

"At eight hundred degrees below zero Fahrenheit silver has no
measurable resistance to the passage of an electric current. Now watch."

Teddy laid the bracelet on top of a frame wound with many turns of
glistening copper wire. He threw on a switch, and a small generator at
one side of the laboratory began to run with a humming purr.

"Eddy currents are whirling all around that bracelet. A strong current
is running in an endless circle in that closed circuit of silver,
nine hundred degrees below zero. Silver at that temperature offers no
resistance to an electric current. Closed circuits have been left at
that degree of cold for over four hours, and at the end of that time
the electric current was still flowing round and round like a squirrel
in a cage."

Teddy picked up the bracelet with a pair of wooden tongs. He took a
second pair in his other hand. Rubber handles insulated the tongs from
their handles.

"There's a current flowing around the inside of this bracelet. There
was one flowing around it when the professor received it in the mail.
He opened it with his bare hands, suspecting nothing. I open it with
these insulated tongs. Watch."

He jerked on the two tongs. The bracelet parted at the catch, and a
dazzling, blinding flash of light appeared with a sharp crackle at the
parting.

"I made the current jump the gap. The professor took it through his
body and it killed him. Are you satisfied?"

"God!" said the commissioner of police, aghast.

"The box and wrapper," said one of the men who had come with the
commissioner. "Let us have the box and wrapper the bracelet came in and
we'll get the man that mailed it. But we'll handle him with tongs,
too, when we close in on him."

They took what they wanted and left. Teddy turned to the commandant.

"Now, sir, we'll see what can be done about the new berg. You say
there's no plume of steam. Have you had an aëroplane fly above it to
make sure?"

"Yes. The pilot says the whole ice cake is covered with mist, except
for a round spot in the middle, but there's no sign of a steam plume."

Teddy nodded at Evelyn.

"No holes in this cold bomb. I wonder what happens to all the heat that
comes in?"

"Father mentioned that he expected something of the sort, but didn't
say what he thought could be done about it."

"The same as we did with the other, I suppose," said Teddy
reflectively. "Only this time we'll have to blast down to the bomb and
then break it up."

"I'll set men to work if you'll find the bomb," said the commandant.

"Almost any one could find it," Teddy remarked, "but there are going to
be some queer difficulties when you get near the cold bomb. If you'll
allow me, I'd like to be at hand when it is broken up. I may really be
of use there."

He began to pick out instruments he thought he might need. Among other
things he took what seemed to be two silvered globes with small necks.
They were Dewey bulbs. Several low-temperature thermometers and a
thermocouple connected with a delicate galvanometer completed his
preparations.

The two men left the house and started for the launch that would take
them to the forts. On the way Teddy was asking crisp questions about
the explosives he could have placed at his disposal, quite ignorant of
what was happening at that moment in Jacksonville.

The river there was a mass of ice from one shore to the other. All
the little reedy islands and the swampy shores were frozen solidly. To
see the slender palm trees rising from icy shores, their reflections
visible on the narrow strip of mist-free ice that ran along the shores
of the river was an anomaly. To see fur-clad tourists stepping out
of the tropical foliage to step gingerly out on the ice "just to
say they'd done it" was even more strange. At the moment, however,
interest centered on a little group of soldiers out in the central
clearing in the cloud of mist. They were bundled in furs and swathed in
numberless garments until they looked like fat penguins or some strange
arctic animals. A major of engineers was waving them to the right and
left, forward and back until they stood at equal distance around the
clearing. Each man moved backward until the mist that rose gradually
from the ice reached his waist. Then, at a whistle signal from the
major, they began to move forward toward a common center. The major
had reasoned that the cold bomb must be precisely underneath the exact
center of the clearing, and this was a rough-and-ready means of finding
that center. They advanced toward each other, and as they went nearer
the center of the clearing the cold grew more intense. Infinitesimal
ice crystals glittered in little clouds where the moisture of their
breath froze instantly in the terrific cold. At a second whistle from
the major they halted. They formed a fairly even circle about forty
yards across. Each man began to stamp and fling his arms about to keep
from freezing in that more than frigid atmosphere. No man could have
stood that cold, no matter how hardy he might be, for more than a very
few moments. The major trotted around the circle, marking the place
where each man stood. Four small sledge loads of explosives stood out
in the clearing. The major intended to blast down toward the cold bomb
with them.

The major was marking the position of the last man, completing his
circle under which the cold bomb must lie, when a peculiar tremor was
felt by every man there. It was not like the shiver of an earthquake
or the reverberation of an explosion. It was an infinitely shrill
vibration that a moment later was followed by a creaking sound that
seemed to come from the center of the ice cake. The men on the ice
stopped their stamping and swinging of arms to listen in instinctive
apprehension.

The center of the circle around which they stood seemed to rise in the
air. The ice on which they stood was shivered into tiny fragments. A
colossal and implacable roar filled the air, and a great sheet of flame
of the unearthly tint of a vaporized metal rose to the heavens. The
swathed and bundled soldiers were annihilated by the blast. A great
hole five hundred feet across gaped in the center of the ice cake.
Jacksonville shook from the concussion, and the plate-glass windows of
its stores and office buildings splintered into a myriad tiny bits that
sprinkled all its streets with sharp-edged, jagged pieces.

Teddy Gerrod, all unconscious of the fate of those who had attempted to
meddle with the Jacksonville ice cake, went on out to bare and blast
open the cold bomb that blocked New York harbor.




CHAPTER VI.


Teddy Gerrod straightened up and beat his hands together.

"Forty-seven below," he said to the soldier behind him. "Put a marker
here."

He moved off to the right. Already a dozen little flags showed where
the temperature reached that degree. Teddy was drawing what he would
have termed an isothermal line--a line where the temperature was the
same. He was making a circle about a large part of the open clearing
on the ice floe. Other flags led back into the mist, marking a path,
and from time to time a party of four or five fur-clad soldiers arrived
from the fort, dragging a loaded sledge behind them. They emptied the
load from the sled, turned, and vanished into the mist again. A small
pile of drills, explosives, and two of the squat trench mortars had
already been made.

When the circle of little red flags had been completed, two
signal-corps men set up their instruments and accurately located the
center. Directly under that spot, if Teddy's reasoning was correct,
the new cold bomb was resting. The sledge from the fort arrived again,
bearing a curious trench catapult for flinging bombs. Four long strips
of black cloth were unrolled, under direction of the signal-corps men,
pointing accurately to the center of the circle. No one had been able
to approach nearer, thus far, than thirty yards from the center. At
that distance Teddy's thermocouple indicated a temperature of more
than seventy-two degrees below zero, and flesh exposed to the air was
frostbitten on the instant. What the temperature of the air might be
directly above the cold bomb could only be conjectured.

One of the infantry men from the fort, the best grenade man in the
garrison, now picked up a Mills grenade, and after carefully picking
out the target with his eye, aided by the strips of black cloth, flung
the small missile. A hole perhaps four feet deep and twice as much
across was blasted in the brittle ice. A second, third, and fourth
grenade followed. At the end of that time the size and depth of the
hole had been doubled.

The trench catapult was set up. Half a dozen grenades were bundled
together and flung into the now much enlarged opening in the surface
of the ice. There was no explosion. One automatically braced oneself
for the report, and the utter silence that succeeded the disappearance
of the grenades came as a peculiar shock.

"Too cold," remarked Teddy to the young lieutenant in charge.

The lieutenant nodded stiffly.

"We'll try again."

A second batch of grenades was flung into the hole, and the same quiet
resulted.

"I would suggest----" Teddy begin.

"We'll fire a trench-mortar bomb," said the young lieutenant.

The heavy winged projectile flew up into the air, and then descended
squarely into the opening in the ice. Those standing fifty yards away
could hear the crash as it struck, and then a sound as of musical
splintering. The young lieutenant swore.

"The fuses are no good. Try once more."

"You can shoot all day and they won't go off," said Teddy mildly. "It's
too cold down there."

The officer said nothing, but supervised the firing of a second mortar
bomb with precisely the same result. He swore again.

"It's probably quite as cold as liquid air down there," said Teddy.
"In fact, there's quite possibly a pool of liquified air at the bottom
of the hole. Your bombs fall into that air and are frozen so solidly
before they strike that the metal gets brittle and simply falls to
powder from the shock. You can't do anything going on this way."

The young lieutenant hesitated, then turned to Teddy somewhat sulkily.

"What do you suggest, then?"

"We'd better enlarge the hole first. Blast down the walls of the
present cavity, then use wrapped dynamite until we have a shallow
crater. Then we'll place our explosives by long poles, keeping
them warm by running resistance wires around them and heating them
electrically."

The young lieutenant considered and agreed. Teddy went back to the fort
to arrange for the heated bombs and the long poles. When he returned
there was only a saucerlike depression in the ice clearing. It was
quite fifty yards across, but no more than twenty deep. Standing near
the edge, one could see the ice near the bottom glistening liquidly.
Air, liquified by the intense cold at the bottom of the crater, wet the
surface of the ice there.

"And that means the temperature down there is three hundred and
twenty-five degrees or more below zero Fahrenheit," explained Teddy
casually. "Here's where we use our heated explosives."

For an hour the party worked busily. Storage batteries brought out on
sledges furnished the current that kept the explosives from becoming
inert through cold. Charge after charge was fired, and the bottom of
the crater grew steadily deeper. At the lowest point a little puddle of
liquified air collected.

"We must be pretty nearly at the cold bomb now," said Teddy
thoughtfully. "There's a mass of liquid air at the bottom of our
crater, and something tells me there's solidified air at the bottom of
that puddle. That means seven hundred-odd degrees below zero."

He was clad in the warmest garments that could be found, and every one
of the others working in the clearing was quite as warmly clothed,
but the cold was intense. One of the soldiers by the small pile of
explosives was chewing a cud of tobacco. He spat. The brownish liquid
froze in mid-air and bounced merrily away across the ice. The soldier
looked at it with his mouth open, then shut it quickly. A thin film
of ice had formed from the moisture on his teeth. The breast of every
member of the party was covered with sparkling snow crystals from the
congealed moisture of their breath.

"I begin to doubt if we can keep our stuff from freezing much deeper,"
Teddy commented. "We want to go down as deep as we can before we use
our Dewey bulbs, though. I've only two of them."

The young lieutenant bustled away, and presently returned.

"The men say that the last bomb won't go off," he said aggrievedly.
"Your heating plan doesn't work."

"I didn't expect it to work indefinitely," said Teddy mildly. "We want
to clear out that liquid air and shoot our two Dewey globes before it's
had time to reform. Will you please have a charge made ready to be
fired just above the surface of that puddle? That should clear it away.
Immediately after that charge has gone off we'll drop our two T. N. T.
charges in the Dewey bulbs. They ought to show us the cold bomb."

The dynamite charge was suspended about a foot above the surface of the
watery, bubbling pool. Air was in that pool, air turned to transparent
liquid by the intense cold. At -325° Fahrenheit air becomes a liquid.
Here, exposed to the sunlight and the blue sky, a pool of liquified
gas had collected from the incredible cold of the cold bomb below. The
charge of explosive burst with a shattering roar. The echoes of the
explosion had not died away when the two Dewey bulbs filled with T. N.
T. fell into the bared ice cavity. A Dewey bulb is a combination of
six vacuum bottles placed one outside the other. They are used for the
keeping of liquid gases at a low temperature, but are obviously just
as effective in protecting their contents from exterior cold. They
fell some five yards apart and rolled, then were still. Their fuses
sputtered. They went off together. A huge mass of shattered ice was
thrown aside, and a dark, globular mass was exposed to view. Almost as
soon as it was exposed to the air a crust of frozen air coated it, and
liquified air began to trickle down its misshapen sides. There could be
no doubt but that it was the cold bomb, invented by an insane genius to
make him master of the world.

Those about the rim of the crater looked at it and turned away. Just as
the intense heat of a blast furnace sears unprotected flesh even yards
from its flame, so the incredible cold of the dark object pinched and
wrung with its freezing rays. Not one man who looked upon the cold bomb
but suffered from a deep frostbite.

"We can't approach that thing," said Teddy, with his hand over his
eyes. "I'd just as soon, or sooner, try to tinker with burning
thermite. We'll have to shoot armor-piercing shells at it. They'll
freeze when they get near it, but the impact ought to crack the thing."

He motioned to the fur-clad soldiers to move back from the crater, and
after a hasty consultation with the lieutenant went off toward the fort
to ask for a small-caliber field gun.

The lieutenant paced back and forth restlessly. He was an ambitious
young man. He did not relish taking orders from a civilian like Teddy.
His eye fell on the heap of equipment that had been brought out from
the fort. Two trench mortars, a trench catapult, a liquid-flame
apparatus--one of the American inventions that had far outdone the
original German _flamenwerfers_! There had been some thought of trying
to reach a point just above the cold bomb and melting the ice down to
it with liquid flame. That had been quickly proven impracticable, but
the liquid-fire apparatus had not been sent back. The young lieutenant
was not stupid. On the contrary, he was a singularly intelligent man.
In a flash he saw how the liquid flame could have been used much more
efficiently than Teddy's resistance coils about his explosive charges.
The idea simply had not occurred to Teddy, or the young lieutenant,
either. Now, however, he became all eagerness. If he succeeded in
breaking up the cold bomb during Teddy's absence it would be a feather
in his cap. If, in addition, he pointed out a method of dealing with
the cold bombs superior to Teddy's plodding system, it would certainly
mean his promotion and a very desirable reputation for himself in his
profession.

He gave his orders briskly. The liquid-flame tank was set up, and began
to spray out its stream of fire. The young lieutenant had it trained so
that it passed just above the top of the ungainly cold bomb and grazed
the upper edge. Then the two trench mortars were made ready for firing.
The young lieutenant set them at their proper elevation himself. He
was tremendously excited. He pointed the two mortars with the most
meticulous precision. To aim them properly he had to expose his face
again and again to the direct rays from the cold bomb, but he paid no
attention to the searing, freezing rays.

The stream of liquid fire shot upward in a perfect parabola, and fell
evenly, exactly, where it was aimed. The young lieutenant knew that a
mortar bomb would be frozen by the intense cold if it were fired at
the cold bomb direct, but his plan got around that difficulty. With
the liquid fire playing just above and grazing the cold bomb, when the
shell from the mortar struck the incredibly cold surface, both the
shell and the cold bomb would be bathed in flame.

All was ready. The lieutenant fixed his eyes on the cold bomb and gave
the signal. The two small trench mortars spouted flame. Two ungainly
bombs rose high in the air and fell hurtling down toward the strange,
frosted object at the bottom of the crater. One of the bombs would
fall a little to the left. The other--squarely on top!

The cracking explosion of the bomb from the trench mortar was lost in
the greater roar that followed it. Before the young lieutenant or any
of his men could lift a finger they were enveloped by a colossal sheet
of vaporized metal that seemed to fill the earth, the air, and all the
sky. Of a weird and unearthly tint, the white-hot flame leaped into the
air. It sprang up three thousand feet in hardly more than two seconds.
The blast had the velocity of many rifle balls, and the withering heat
of molten metal. The young lieutenant and his men were swept into
nothingness in the fraction of a second. The crater they had worked
for hours to blast out was as a puny ant hole beside the vast chasm
that opened in the ice down to the red clay far beneath the bed of the
Narrows. And New York shook and trembled from the shock of the terrific
explosion.




CHAPTER VII.


Teddy was thrown down by the concussion, and fell in a heap against
the commandant. He leaped to his feet and rushed to the window, from
which the glass had disappeared. He saw the remnants of the sheet of
flame dying away and saw that the low-lying cloud of mist had been
blown from the surface of the ice. A gaping orifice, five hundred feet
across, showed itself where Teddy and the lieutenant had been working.
Of the lieutenant and his men no trace could be seen. Two or three of
the little red flags that had marked the path through the mist still
remained, however, and a small sledge was lying, overturned, beside the
sledge route. Four tiny black figures lay in twisted attitudes beside
the sledge. As Teddy looked one of them began to struggle feebly.

Teddy stared, speechless. For a moment he was dazed by the suddenness
and the overwhelming nature of the calamity that had befallen the
young lieutenant and his detachment. Only accident had saved him from
a similar fate. Then his professional instinct re-asserted itself, and
he began to piece together what he knew of the bomb. In a moment the
solution came to him.

"Varrhus planned this," he said unsteadily. "He filled up his hollow
cold bombs with solid iron. The heat that would come in would first
melt and then vaporize the interior until the pressure inside was more
than the still-solid crust could stand. And all that vaporized iron
would burst out. What a fiend that man must be!"

An hour later, baffled and discouraged, he was sitting in the
laboratory with his head in his hands, trying desperately to grapple
with this new problem. The new cold bombs apparently could not be
assailed without destruction of those who attacked them. It was
impossible to imagine that volunteers could be found to sacrifice
their lives to destroy each new bomb as it was placed. The horror of
being annihilated by a blast of metallic vapor would deter men who
would not hesitate to face death in a less terrible form. And Varrhus
was evidently able to place them again nearly as fast as they were
blown up. Telegrams announcing the explosion of the Jacksonville and
Charleston ice floes lay before Teddy, supplemented by a cablegram from
Panama saying that the Miraflores Locks had been destroyed by the blast
when the Panama cold bomb had burst. Teddy was nearly certain that the
next morning would find the exploded bombs replaced. Varrhus' black
flyer was evidently capable of carrying a great weight at an immense
speed. It also seemed able to reach an almost incredible height, from
the fact that the second cold bomb had been dropped in the Narrows in
broad daylight without the flyer having been sighted.

Evelyn turned from the instruments with which she had been working. She
had scraped off a small bit of the lacquerlike surface of the silver
bracelet, and had been analyzing it in the hope of finding what element
or combination had been used to produce the mystifying heat-inductive
effect.

"Teddy," she said depressedly, "I can't find a thing. The lacquer
effect seems to be simply the appearance of some way he has treated
the metal. The surface gives just the same analysis as the filings from
the inside of the metal. I took a spectro photo and it gives silver
lines with a trace of lead. Analysis by arsenic reduction gives the
same result."

"Perhaps those detectives will be able to trace Varrhus by the mailing
box they took," said Teddy, without much hope. "It's not very likely,
though. We've _got_ to think of something!"

Silence fell in the laboratory again, broken only by the faint
whistling sound of the flame Evelyn had used in her analytical work.

"The trouble is," said Teddy grimly, "that we've been _trailing_
Varrhus, instead of anticipating him. If we could know where he was
going to be----"

"He'll have to show up sooner or later," Evelyn commented. "We know,
for instance, that he'll have to replace that bomb in the Narrows or
let the harbor stay open. The use of these new explosive bombs means
that he has to expose himself more than he'd have to with the old ones."

"There ought to be an aërial patrol above the city----"

Teddy stood up sluggishly, discouragement in every line of his figure.
A servant tapped on the door of the laboratory.

"Lieutenant Davis, of the military flying corps, sir."

"Show him in," said Teddy listlessly.

A slim young officer came in. His friendly, boyish face was full of a
whimsical humor.

"This is rather an intrusion, I'm afraid," he said half apologetically,
"but I thought you might be able to help me out."

"I've done nothing so far," said Teddy in a rather discouraged tone.
"Miss Hawkins and I were just canvassing the situation. You're talking
about the iceberg and Varrhus, aren't you?"

"Of course. No one talks about anything else nowadays. My taxi had
a tough time getting through the crowds on the streets. They don't
understand about the explosion in the Narrows yet."

Teddy introduced him to Evelyn.

"Pleasure, I'm sure," said Davis with a smile. Then his face sobered.
"That was rotten hard luck about your father, Miss Hawkins. I'm not
good at making speeches, but I hope you realize that every one is
sympathizing with you and in a measure sharing your sorrow."

Evelyn shook hands.

"I will allow myself to grieve when Varrhus has been disposed of," she
said quietly. "Until then I dare not let myself think."

Davis released her hand and turned to Teddy.

"Varrhus--or the chap in the black flyer, anyway--killed my best
friend, Curtiss. He was driving the little Nieuport that attacked
Varrhus the day you blew up the first bomb. I was the first man to
reach the spot where Curtiss had crashed, and I swore I'd get Varrhus
for that."

"I remember," said Teddy. "Frozen."

Davis nodded, his face grave.

"I have what is probably the fastest little machine in the United
States, at the fort. A two-seater, with twin Liberty Motors that shoot
her up to a hundred and fifty miles an hour without any trouble at
all. I think I can get Varrhus with it. I came to you to learn what you
think about Varrhus' weapons. It's only the part of wisdom to learn all
you can about your opponent, you know."

Teddy found the young man impressing him very favorably.

"I haven't given the matter much thought," he confessed, "but you
remember Varrhus' tactics?"

"He dropped like a tumbler pigeon," said Davis, "and Curtiss overshot
him. There wasn't a sign of firing except from Curtiss. He simply
overran the place where Varrhus had been three or four seconds before
and then dropped. He was frozen stiff when I found him."

"I think," said Teddy carefully, "that Varrhus had shot up a jet of
some liquified gas, probably hydrogen. It hung suspended in the air for
a moment, and in that moment the biplane ran into it. A drop of liquid
hydrogen placed in the palm of your hand would freeze your arm solidly
up well past the elbow. It's something over five hundred degrees below
zero. Your friend ran into what amounted to a shower of it."

Davis considered:

"Cheerful thing to fight against, isn't it?" he asked, with a smile.
"Tactics, mustn't run above the black flyer and mustn't run below it.
He can probably shoot it straight down, too."

"And almost certainly from the sides," said Teddy. "The man must have
been working on this thing for years, and even if he's insane he'd be a
fool not to make his weapon as efficient as possible."

Davis' expression became rueful.

"And so I'm supposed to keep my distance," he remarked, "and take pot
shots at him while dancing merrily around in mid-air. Can't we do
anything about that stuff to nullify it?"

"Burn it," suggested Evelyn. "Liquid hydrogen burns just as readily as
the same gas at normal temperatures."

The three of them were silent for a moment.

"Would rockets set it afire?" asked Davis presently. "I could keep a
stream of fire balls shooting out before my machine."

"They ought to." Teddy was losing his discouragement in this new
prospect of coming to grips with Varrhus. "I say, will your machine
burn readily?"

"Only the gas tank. The wings and struts are fireproof. New process."

Davis stood up suddenly.

"Would it bother you to come over and look at my machine? We could
probably figure out the thing better then."

Teddy rose almost enthusiastically.

"We'll go over now if you say so."

The taxicab bearing Teddy and the young aviator down to the fort was
forced to travel slowly amid the throngs of apprehensive people that
overflowed the sidewalks and made the streets almost impassable. The
launch took them swiftly to the fort, and in a few moments they had
arrived at the small aviation field behind the fortifications on
Staten Island. Davis led Teddy directly to the shed that contained the
swift machine of which he was so proud. It was a splendid product of
the aircraft maker's art. Twin Liberty Motors developed nearly eight
hundred horse power between them, and two great shining propellers
pulled the machine through the air with irresistible force.

"You see," said Davis, with some enthusiasm, "the motors aren't in the
fusilage, so the gunner sits up here in the bow and can fire freely
in any direction. The one-man planes with synchronized machine guns
firing through the propeller aren't in it with these for real fighting.
They're splendid little machines--I drove one in France--but I honestly
believe this is better than they are. This one responds to the
controls every bit as readily, and with a good gunner----"

"Machine gunner in France myself," said Teddy, touching his breast.
"Would you take a chance on letting me sit up front to-night?"

"To-night?" asked Davis.

"I believe Varrhus will appear to drop another cold bomb to-night. It
will probably be dropped inside the harbor so the ice cake will touch
the Battery. That will set the people frantic, and make them beg the
government to enter into a parley with Varrhus. It's paid no official
attention to him so far, you know."

Davis' expression became keen and rather stern.

"We've four hours before dark. We'll have to set to work."

Teddy went over and stepped up the ladder that leaned against the
cockpit.

"I want to see your gasoline supply," he remarked. In a moment he
came down, looking a trifle dubious. "If I'm right about Varrhus
using liquid hydrogen for a weapon, and we can set it afire, we'll
dive through half a dozen sheets of flame to-night. Something will
have to be done to protect that gas tank from catching fire, and some
protection for the carburetors, too."

"We'll fix that in a hurry," said Davis briskly. "Oh, Simpson! Come
here!"

In twenty minutes there were half a dozen mechanicians at work, and
Teddy was carefully inspecting the machine gun at the bow of the
fusilage.

Teddy telephoned back to Evelyn what he anticipated would occur that
night and his own share in it.

"Of course there's some risk in it," he finished, "but I guess we'll
come out."

Evelyn's voice was more anxious than Teddy had expected.

"Do be careful, Teddy," she said in a worried tone. "Please be very
careful. Varrhus has so many fiendish weapons. I'm terribly afraid."

Teddy's voice was grim.

"With the kind assistance of the German government," he remarked, "we
have a few fiendish inventions, too. I'm using explosive bullets only
to-night. Varrhus is outlawed."

Evelyn spoke almost faintly.

"But take good care of yourself, please, Teddy," she urged. "It were
better that Varrhus got away this once than that you should be killed
for nothing."

Teddy smiled. "I've no intention of being killed, Evelyn, but I have
some intention that Varrhus shall be."

There was a curious sound from the other end of the wire.

"But--but----" Evelyn's voice died away. "I'm--I'm going to be praying,
Teddy. Good-by."

The last was very faint. Teddy turned from the instrument and went
out to where the aëroplane had been rolled from its shed. The sun was
sinking and dusk was falling. Time passed and darkness settled down
upon the earth. Stars twinkled into being. A long searchlight poked a
tentative finger of light into the sky.

"We'd better be going," said Davis thoughtfully. "We want to be well up
before he appears."

Teddy clambered up to his seat and adjusted the straps that would
hold him in place. He pulled down the helmet and fitted the telephone
receivers securely over his ears. A telephone was necessary for
communication with Davis, four feet behind him, because of the
tremendous roar of the engines. He took the machine-gun butt and found
the trigger, then made sure the first of a belt of cartridges was in
place. He settled back in his seat as the mechanics began to twirl
the propellers. He was going out to fight the black flyer, but most
incongruously he was not thinking of Varrhus at all. His thoughts dwelt
with strange intensity upon Evelyn.




CHAPTER VIII.


New York lay below them. The long, straight lines of lights shining up
through the semidarkness of the moonlit night made a strange appearance
to the two in the swift machine. Davis had mounted to a great height,
some ten thousand feet, and the pin points of light outlined more than
a dozen cities and towns. The Hudson was a faintly silvery ribbon
flowing down placidly from a far-distant source. Because of the ice
cake in the Narrows its level had risen two or three feet, but now it
flowed smoothly over that great obstacle, melting and carrying it away
toward the sea.

The fighting plane roared around in huge circles, seeming strangely
alone in the vast expanse of air. One searchlight from below moved
restlessly about the sky. A second joined it, then a third. One by
one a dozen or more of long, pencil-like beams of light shot up into
the sky and moved here and there in seeming confusion, but actually
according to a carefully prearranged plan. A hooded red light showed
below the biplane in which Teddy and Davis were awaiting some sign of
the black flyer. That had been agreed upon, and none of the searchlight
beams flashed upon the circling machine. From time to time Davis shut
off the motors, and the two of them lifted the ear flaps of their
helmets to listen eagerly for the musical humming that would herald
Varrhus' approach.

Far to the east they could see where the faintly luminous waters of
the ocean came up to and stopped at the darker masses of the land. The
harbor below them glittered in the moonlight. The only peculiarity in
the scene was the absence of the little harbor craft that ply about
busily by day and night upon their multifarious errands. They were
all securely docked. The wharves, too, were dark and silent. All the
maritime industry of New York was at a standstill.

A wide spiral to twelve thousand feet. The motors were hushed
during a two-thousand-feet glide, while the two men in the machine
listened intently. For two hours this maneuver had been repeated and
re-repeated. No sound save the rush of the wind through the guy wires
and past the struts had broken the chilly stillness of the heights.
The sky was a blue dome of a myriad winking lights. A pale silver moon
shone down.

The nose of the machine pointed down and the motors ceased to roar.
Faintly but unmistakably above the whistling and rushing of the wind
about the surfaces of the biplane a deep, musical humming could be
heard. Abruptly the motors burst into life again. The exhausts began to
bellow out their reassuring thunder. The machine began to climb again,
circling to every point of the compass, while Teddy and Davis scanned
the sky keenly for a sign of the black flyer with its cargo of menace
to New York.

"I'm going to fifteen thousand."

Davis' voice sounded with metallic clearness in Teddy's ear. The
telephones between the two helmets were working perfectly.

"That was Varrhus, all right?" said Teddy quietly. "Did you signal to
the people beneath?"

Davis pushed a button, and a green light glowed beside the red one in
the hood below the machine. In a moment the receipt of this signal by
those below was evidenced. The searchlights took up their task with
renewed vigor, searching the sky frantically for a sign of the black
flying machine. The hood below the biplane allowed the signal to be
seen by those on the ground, but made the light invisible to any one in
the air. The biplane swung in wide circles, Teddy and Davis with every
nerve taut and every sense alert, aflame with eagerness to sight their
quarry. They saw it, outlined for an instant by the white beam of one
of the circling lights.

It was dropping like a stone from the clouds. The searchlight rays
glistened from polished black sides and were reflected from shimmering
propeller blades above it.

"Helicopter," said Davis crisply. "Now!"

The black flyer was a thousand feet below them and still falling. The
nose of the biplane dipped sharply and it dived straight for the still
falling machine. Teddy gripped the machine gun and sighted along the
barrel. Down, down, the biplane darted, all the power of its eight
hundred horse power aiding in the speed of its fall. The glistening
black machine checked in its drop and hung motionless in mid-air. The
pilot was evidently unconscious of the machine swooping down upon him.

Five hundred feet down, six hundred----Teddy pulled hard on the
trigger, and his machine gun spurted fire. A stream of explosive
projectiles sped toward the menacing black shape. Teddy saw them strike
the shining sides of the machine and explode with little bursts of
flame. The biplane was rushing with incredible speed toward the other
flyer. Teddy played his machine gun upon it as he might have played a
hose, and apparently with as little effect. The tiny explosive shells
struck and flashed futilely. The black flyer seemed to be unharmed.
After a second's hesitation, it dropped again abruptly. The biplane
shot toward the spot the other machine had occupied. The distance was
too short to turn or swerve, quickly as it responded to the controls.

"Flares," gasped Davis, but before he spoke Teddy was pressing the
small button that would set them off.

A burst of tiny lights shot out before the biplane, many-colored
balls of fire driven forward from a tube below the fusilage. They
illuminated the air for a short distance, entering the space from which
the black flyer had just dropped. Teddy and Davis saw a small cloud of
what seemed to be mist or fog hanging in the air. The tiny fire balls
darted into it the fraction of a second before the biplane itself had
to traverse the same space. As the first of the lights struck the
fringe of the whitish cloud it flared up. The fire ball had touched a
droplet of liquified gas and set it flaming. It burned fiercely and
with incredible rapidity, setting fire to the remainder of the cloud.
Teddy ducked his head as the aëroplane shot madly through a huge globe
of blazing gas in mid-air.

"Great God!" gasped Davis. "Now where's Varrhus?"

The heavy masks the two aviators had worn had protected them from the
flaming hydrogen, and their goggles had saved their eyes. Now Davis was
only eager to make a second attempt upon the black machine. He swerved
and circled. The searchlights below were waving frantically through
the air. The flare aloft had been seen, and they concentrated upon
the space below the spot. In a second the black flyer was once more
outlined by half a dozen beams. Davis banked sharply and darted toward
it again.

The pilot of the strange machine seemed to be quite confident that he
had disposed of his antagonist, and was apparently busy with something
inside the cabin. He was probably preparing to release his cold bomb,
but was again interrupted. The biplane approached. Teddy saw his
explosive bullets strike and flash. He knew they struck, but they
seemed incapable of doing harm. The black flyer was clearly defined by
the searchlights, and Teddy could see it distinctly. It was a long,
needlelike body with a glass-inclosed cabin near the center. Above it
four whirring disks of comparatively huge size showed the position of
the vertical propellers that enabled it to rise and fall and to hang
suspended motionless in the air. A fifth propeller spun slowly at the
bow. That was evidently not running at full speed. Below the needlelike
body hung a misshapen globe, like the bulging ovipositor of some
strange insect.

Flash! Flash! The impact of the explosive bullets was marked by
spiteful cracks as they burst. Teddy was aiming for the cabin of the
machine.

"Got him!" he exclaimed.

The glass of the cabin windows had splintered into fragments. The
aëroplane shot toward the motionless black flyer.

"Shall I ram?" asked Davis in a perfectly even voice. He was quite
prepared to sacrifice both his and Teddy's lives to make absolutely
certain of the destruction of the menacing helicopter with its more
than dangerous occupant.

Teddy, with lips compressed, nodded. He had forgotten that in the
darkness Davis could not see his movement. As the biplane sped forward
the black machine dropped again. Again the whitish cloud was left
behind it, clearly defined in the searchlight rays. Teddy had barely
time to press the flare button before they reached the cloud. The mist
of atomized liquid hydrogen seemed to burst into flame all about them.
The aëroplane roared through hell-fire for a moment. Flame was before
Teddy's aviator's goggles. He was in a veritable inferno. Then the
aëroplane shot free again.

"Ram him!" panted Teddy. "Smash him! Do anything, only we've got to get
him!"

They circled swiftly, searching for the black flyer. The searchlights
were following him now, and they saw that he was rising straight up.
He had not yet dropped his cold bomb. Davis put his machine at the
ascent at as steep an angle as he dared. They climbed almost as
rapidly as the helicopter. The black machine made its first aggressive
move now. Davis was climbing in a jerky spiral, rising at an amazing
speed. Teddy was busily fitting a new belt of cartridges into his
machine gun. The pilot of the other machine darted to one side and a
huge cloud of mist sprang into being just below him, darting downward
like some pale-gray snake, unfolding itself in the sky. Davis zoomed
sharply. Another second and he would have run into the whitish cloud.
The biplane recovered and swerved to one side. Twelve thousand feet.
Thirteen thousand feet. Fourteen thousand feet. Three miles in the
air! Then the black flyer began to drop. The biplane dived after him,
Teddy's machine-gun spitting fire and explosive bullets in a furious,
well-directed blast. Once, twice, bursts of the little flashes that
showed his bullets were striking served to reassure Teddy, but the
biplane could not gain on the falling helicopter.

Down, down----There were half a dozen quick bursts of flame in the
air. Anti-aircraft guns were firing. The black flyer dropped unharmed.
Barely a thousand feet above the waters of the bay, the propeller
at the bow seemed to be put into motion, for the straight descent
changed into a graceful curve. The curve flattened out, and the black
machine ceased to fall. It sped madly for the Narrows, with a bedlam
of bursting shells all about it and the vengeful, spitting two-seater
darting after it like an avenging Nemesis. Again and again spurts of
flame against the body of the glistening helicopter showed that Teddy's
fire was well directed, but the machine shot onward in a furious rush
for the Narrows. Above the Narrows, without pausing, a black object
that turned to white in the searchlight rays fell from the misshapen
globe below the center of the black flyer's body. The thing that fell
seemed to leave a mist of fog behind it as it dropped. Then, its
mission accomplished, the dark machine fled toward the west.

Teddy and Davis, in the biplane, sped after it at the topmost speed of
which their aëroplane was capable. Teddy was nearly insane with baffled
rage and disappointment. He knew that he had failed. Another cold bomb
had been dropped in the Narrows, and any attempt to destroy it would
only result in the death of those who made the attempt.

"Faster, faster!" he pleaded to Davis. "If it gets far ahead of us
we'll lose it in the darkness."

Davis pressed his lips together and used every artifice he knew of to
increase the speed of his machine, but the glistening black body ahead
of them drew steadily farther away. At last it could barely be seen.
Then, as if in derision, a light appeared in the cabin of the black
flyer. It winked oddly. Dot-dash, dot-dash----

"He's signaling," said Davis.

Dot-dash, dot-dash----

"W-a-t-c-h," spelled Davis, "t-h-e
M-i-s-s-i-s-s-i-p-p-i.--V-a-r-r-h-u-s."

"Watch the Mississippi, Varrhus," repeated Teddy. "He's getting away!
He's getting away!"

The light ahead of them winked and disappeared. The sky was empty
except for the biplane roaring after a vanished enemy.

"He's gotten away," half sobbed Davis. "Damn him! He killed Curtiss,
and he's gotten away!"

Teddy stared into the empty night with something of Davis'
disappointment and despair.




CHAPTER IX.


Next morning the world read at its breakfast table that the Mississippi
River had frozen over just below St. Louis, and that the water was
rising rapidly. The river had frozen solidly up to the surface. The
level rose, and the water started to flow over the top of the ice cake,
only to be turned into ice as it did so. Hour by hour the level rose,
and hour by hour the solid ice barrier rose with the water level. Men
had tried to blast a way through for the rushing waters, but without
effect. As fast as the water tried to flow through the opening made by
a charge of dynamite it froze again and plugged the hole through which
it was attempting to escape.

Hastily improvised levees were thrown up, but the water outstripped
the efforts of the builders. The lower part of St. Louis was flooded,
and a great part of the population made homeless. Then low-lying lands
beside the river were gradually submerged. In twenty-four hours there
were calls for help all along the upper part of the Mississippi Valley.
The rising water had flooded immense areas of cultivated land, and even
larger areas were threatened. In another day a thousand square miles
of crops were under water, and the loss in live stock was assuming
formidable proportions. The new cold bomb in New York harbor had crept
up to the Battery, as Teddy had foreseen. The Norfolk cold bomb had
exploded, fortunately without loss of life. Gibraltar had witnessed
three almost simultaneous blasts, and was again free of ice, but the
whole world knew that it was at the mercy of Varrhus.

Davis, Evelyn, and Teddy were discussing the matter dolefully. Davis
had been coming to the laboratory daily in the hopes of hearing that
Teddy had devised some plan for the frustration of Varrhus' ambitious
schemes. Teddy found himself liking Davis immensely, but with a
peculiarly illogical annoyance that Evelyn seemed to like him quite as
well. When he had phoned her of his safety after the fight with Varrhus
he could hear a flood of thankfulness in her voice, but when he saw
her the next day she was almost distant. He saw traces of real anxiety
on her face, but she had not been really natural until they had worked
nearly all day on the silver bracelet, trying to find what had been
done to the surface to give it its peculiar property of allowing heat
to pass in one direction, but not in the other. They were as far as
ever from the solution. Davis was quite ignorant of abstract chemistry
or physics and could not join in their discussions, but Teddy fancied
that he was much more interested in Evelyn than was necessary. He was
annoyed to find that he resented it. He had always looked on Evelyn
as a comrade, and he could not understand this feeling that took
possession of him. It did not occur to him to speculate upon the fact
that he found ideas coming to him much more readily when working by
Evelyn's side, or that he rarely attempted anything without asking
her opinion. Teddy had never thought much of romance, and he did not
suspect how much Evelyn's companionship meant to him.

Davis was reiterating for the fortieth time his disappointment at
Varrhus' getting away.

"We almost had him," he said disgustedly. "Our explosive bullets were
playing all over his infernal flying machine. We'd have landed one
in that little glass cabin of his and smashed him nicely in another
minute, when he skipped off like that. And I'll swear to it we were
doing a hundred and eighty miles an hour."

"He ran away from us pretty easily," said Teddy dismally. "Isn't there
a faster machine than yours we could get hold of?"

"Nothing but a single-seater, and not so much faster at that,"
said Davis. "A hundred and ninety-five is the best even the latest
single-seater combat planes will do at a low altitude."

"Even for a short burst of speed?" asked Evelyn.

"Diving, you'll run up faster than that," Davis explained. "When we
went straight down after Varrhus, we must have gone over two hundred,
but for straightaway work we've nothing that will catch Varrhus."

"What's the official speed record?" asked Evelyn, toying with a test
tube. She looked singularly pretty in the long white apron she wore in
the laboratory.

"Two hundred and fifteen, I think," said Davis. "Some Spanish aviator
made it. He'd doped his gas with picric acid, though."

"What does that do?" asked Teddy quickly.

"It's explosive, and about doubles the force of your explosions. It
eats your engines right up, though. They used to use it in motor-boat
races until a rule was made against it. You see, an engine is ruined
after twenty minutes or so, and it made the racing unfair for people
who couldn't buy a new engine for every race."

Teddy's face grew thoughtful.

"Picric acid," he said meditatively. "Suppose we used it in the gas of
your plane. Would we have a chance of catching Varrhus?"

"I don't know," Davis said thoughtfully. "I hardly think so. It would
make our speed better, but if it were anything of a chase our motors
would be ruined before we'd gone far."

"The acid attacks the steel of the cylinders and makes the bore too
large?" Teddy seemed to be thinking rapidly.

"Yes. You lose all your compression."

Teddy looked at Evelyn.

"Suppose the pistons and the interiors of your cylinders were plated
with platinum? Platinum is one of the hardest metals, and should stand
up under a great deal of wear."

"Would platinum resist the attack of the acid?" Davis grew excited.

"Surely."

Davis jumped to his feet.

"Then we've got him! New piston rings will let you plate the cylinders
without reboring them unless you're going to plate them heavily. Can
you do the plating?"

"Try," said Teddy.

"We make a hundred and eighty with straight gasoline," said Davis
excitedly. "With doped gas----How long will it take to fix my motors?"

"Four or five hours. We'll borrow the acid vats of some electro-plating
concern. Evelyn will mix the solution of platinum salts. I'll go
arrange to borrow the vats while you get your motors disassembled and
brought here on a motor truck."

Teddy hastily began to put on his coat.

"You're going to try to fight Varrhus again?" asked Evelyn anxiously.

"Are we?" asked Davis cheerfully. "Just ask me! We are."

"You hit him several times in the last fight," said Evelyn faintly,
"and it didn't do any good."

"We'll use armor-piercing bullets this time," said Davis exuberantly.
"Or we may be able to mount a one-pounder automatic. I think the plane
will stand it. And at worst we can ram him."

Evelyn turned a trifle pale. "That means you'll both be killed."

Davis smiled. "Maybe not. We'll take a chance anyway, won't we, Gerrod?"

Teddy nodded shortly. "I'm going to get Varrhus or he's going to get
me," he said succinctly.

They started for the front door. The commissioner of police was just
getting out of his car.

"News, most likely," said Teddy, and they waited.

The commissioner of police looked worried when he shook hands with
Teddy.

"My men have been trying to trace that package that contained the
bracelet," he told him, "and have found that it was put in a country
rural-delivery mail box after dark. The mail carrier took it when he
made his morning route. There's absolutely no way of tracing it any
farther. Any one might have passed by in an automobile and have put it
in. The farmer in whose box it was is above suspicion. Now another set
of letters has been sent in the same way from another rural-delivery
box a hundred miles from the first. One is addressed to Miss Hawkins.
I have it here. The postal authorities called me in when they saw the
envelope."

He showed a huge yellow envelope addressed to Evelyn. In one corner was
a large return card. "_The Dictatorial Residence._"

"It might be almost anything," said Davis. "Better not let Miss Hawkins
open it. I'll do it, Gerrod."

Teddy shook his head.

"We'll tell her about it, and I'll open it in the laboratory."

Evelyn and Davis waited apprehensively until Teddy emerged from that
room.

"No cold bombs, no electric shocks, and no poison gas," he said,
smiling. "Just a _billet doux_ to Evelyn. It fits in beautifully with
our plans, Davis."

Evelyn took the sheet he extended to her, and read:

    THE DICTATORIAL RESIDENCE, August 29th.

    His Excellency Wladislaw Varrhus, dictator of the earth, has been
    much annoyed by the efforts of one Theodore Gerrod to obstruct his
    plans and desires. He has been informed through the press of the
    fact that Miss Evelyn Hawkins has collaborated with and encouraged
    Theodore Gerrod in his rash attempts. His excellency the dictator
    is pleased to require that Miss Evelyn Hawkins repair to a spot
    some five miles due east from Norman's Reef, off the coast of
    Maine. Miss Hawkins may bring with her a maid and such baggage as
    she may require. She is to be held as security for the cessation of
    Theodore Gerrod's efforts to impede the secure establishment of the
    dictatorship. The Mississippi River has been closed to traffic, and
    will remain closed until this order has been obeyed by Miss
    Hawkins. The time set for Miss Hawkins' appearance at that spot is
    daybreak of Tuesday, September the third. Given at the dictatorial
    residence.

    WLADISLAW VARRHUS.

Evelyn looked at the three men with a white face. The commissioner of
police looked grave. Davis was smiling, and Teddy was smiling, too, but
with a blaze of anger in his eyes.

"Gerrod," said Davis whimsically, "I am much depressed that Varrhus
didn't include me with you as making efforts to obstruct his plans and
desires."

"The government will have to be notified," said the commissioner of
police solemnly.

"Do--do you think I had better go?" asked Evelyn hesitatingly.

"No!" exploded Teddy and Davis together. Teddy went on: "Why, Evelyn,
the man is insane! And besides we've just thought of something that's
sure to get him. We'll lay in wait for him, and then he'll walk into
our parlor nicely. When he does------"

"_Finis_," said Davis cheerfully, "if I may borrow a phrase from the
French."

"And if it's a long chase," said Teddy even more cheerfully, "the dear
person set the time for dawn, and we'll have light to fight by. Let's
go and set to work on that plane of yours."

They left together in high spirits. Evelyn stood quite still after
they had gone, absently crushing the letter from Varrhus in her hand.
Presently, with a sob, she went to her room and allowed herself to cry.
They would not let her face danger, but Teddy was going out to fight,
perhaps to die--and for her.

Over at the hangar, mechanics swarmed upon the fighting plane,
dismounting the motors and disassembling them. The cylinders and
pistons were being carefully packed. A big motor truck had already
backed up at the wide door of the aëroplane shed, and as fast as the
parts were packed they were loaded on it. Davis was here, there, and
everywhere. He had asked permission for the experiment, and it has been
granted. The government was prepared to risk almost anything rather
than allow Varrhus to succeed in his huge blackmailing of the entire
human race. There was no hesitation in allowing anything that might
afford a fighting chance of downing the black flyer. The Mississippi
floods were growing in size and destructiveness. The New York cold
bomb, dropped the night Teddy and Davis had fought the black machine
over the harbor, was expected to explode at any moment. Every window
still intact in the city had been pasted with strips of paper to keep
the fragments from becoming a menace to those on the streets when the
bomb should burst them.

Davis had conferred with the commandant of the forts, and volunteers
had been asked for among the garrison. A boat was being heavily armed
with concealed guns. It would go to the point where Varrhus would
expect Evelyn to be taken. He would see the small boat, drop down
to take Evelyn on board his evil craft, and the masked batteries of
anti-aircraft guns would open on him in a blast of fire. Teddy's
discovery that flares fired into the cloud of liquified gas would cause
it to burn harmlessly in mid-air had been adapted to protect the crew.
As the guns opened on the hovering black flyer a stream of fire balls
would be made to float overhead to set flaming the stream of liquid
hydrogen Varrhus might be expected to shoot downward. At that, though,
the mission of the boat crew was hazardous in the extreme.

The telephone rang in the hangar. Teddy was on the wire. He had
commandeered the big wooden acid vats of an electro-plating plant,
and the platinum-plating solution was being mixed even then. If Davis
brought the motors over in parts, the plating might begin immediately.

The big truck rumbled off, Davis smiling confidently on the seat
beside the chauffeur. Half a dozen mechanics perched on various parts
of the load. When the truck stopped before the electro-plating plant
they leaped off and rushed the glistening cylinders inside. In twenty
minutes they were in the plating solution and an almost infinitely thin
film of platinum was slowly forming within them.

The workmen of the electro-plating plant labored far into the night
on their task. Teddy had insisted that a film of platinum ten times
the thickness of the usual precious-metal plating be used, and the
process was slow. When the cylinders had been prepared, the pistons
remained, and the exhaust ports and valves. These, too, were coated
with the hard, acid-resisting metal, and Davis' mechanics began their
task of fitting piston rings to the altered motor parts. The rings
themselves had then to be plated, and all the plating burnished and
polished. Teddy and Davis snatched a few hours' sleep while the motor
in its disassembled state was being carried back to the hangar and
re-installed in the aëroplane. They woke, and during all the following
day Davis sat in the pilot's seat, listening with a practiced ear and
aiding in the final tuning up of the changed motors, adjusting the
carburetors to their new fuel. Thirty per cent of picric acid added to
the finest, highest grade gasoline was to be used. No one had dared
use such a percentage before, even for motors that were expected to be
ruined.

Teddy, in the meantime, was familiarizing himself with the small
one-pounder automatic gun--similar to the German antitank
weapons--that was to be installed in the bow of the aëroplane. By
nightfall all was finished. Teddy ran over to New York and saw Evelyn
for the last time before making his attempt, and the next morning he
and Davis flew to Noman's Reef, where a camouflaged hangar had been
erected on telegraphed instructions from New York. Tuesday dawn found
them alert and anxiously scanning the sky for a sign of the black flyer.




CHAPTER X.


The stars winked palely from the graying sky. In the east a pallid
whiteness showed which slowly yellowed and then turned to pink. The
dawn was breaking.

On the little reef men watched keenly. Far out at sea, its single
funnel tipped with red paint from the crimson sunlight, a little boat
tossed and rolled. That boat contained the men who had offered their
lives for a chance to kill this Varrhus, who threatened the liberty of
the world. Beside the camouflaged hangar two great horns, seeming to
be enlarged megaphones, pointed toward the sky. Little wires ran from
their points to telephone receivers strapped on the ears of intently
listening men. They were microphones to detect the first sound of the
musical humming of the black flyer. Teddy and Davis were befurred and
goggled, but had pushed up their goggles to take powerful glasses and
scan the sky eagerly for a sight of their enemy. Mechanics stood ready
at the propellers of the hidden fighting plane, prepared to spin the
motors into roaring life the instant the two aviators had settled in
their seats. From before the wide doors of the concealed hangar a broad
expanse of beach ran smoothly down to the ocean. The little boat tossed
and rolled. The men at the microphones listened intently. The others
searched the sky.

Straight down from a wisp of golden cloud a slim black speck fell
toward the earth. At first, so high was it, even those with field
glasses could make out only the thin shape of the glistening black
body. It fell a thousand, two thousand feet----The whirring disks above
the slender body became visible, then the inclosed cabin near the
center. The musical humming filled the air. Lower and lower the strange
machine dropped. Davis and Teddy were in their seats.

"Now!" said Davis sharply, and the propellers whirled. The motors
caught, sputtered, and began to run with a steady, droning roar.
Davis watched keenly as the black shape slowed in its fall and came
to a standstill above the little, tossing boat. Half a dozen men were
holding the aëroplane back, and the small shed was full of clouds of
choking dust and still more choking fumes from the motor.

The black flyer hung motionless, barely three hundred yards above the
small boat. There was a long moment of waiting. Then the decks of the
boat seemed to fall in. A dozen threatening muzzles were exposed. A
dozen flashes of flame shot up from the tiny vessel. Simultaneously
Davis cried out, the men released his machine, and it darted forward.
He took off from the beach skimmed the waves, and shot out toward the
strange combat that was taking place.

The black flyer had been hit. That much was certain. It lurched and
staggered in the air, losing altitude all the while. Then the pilot
seemed to regain control. He swung swiftly to one side and began to
rise. All the time the anti-aircraft guns were firing viciously.
The tossing boat made a poor platform for the gunners, however, and
their aim was inevitably poor. The guns kept up a ceaseless roaring.
Puff after puff of white smoke showed where their shells burst near
Varrhus. He began to swerve, to zigzag, using tactics strangely like
those of a dragon fly. Suddenly he darted to a point exactly above
the small boat, and a smoky cloud began to dart down from below his
machine. Varrhus passed on, but the cloud fell swiftly, precisely like
the cloud of liquified gas he had poured down on Teddy and Davis above
New York harbor.

"Flares!" cried Davis in an agony of apprehension, though his voice was
only audible to Teddy by means of the telephone connection between the
two helmets.

As he spoke the men on the boat shot up the little fire balls that had
protected the aëroplane in its former fight. A dozen balls of light
sped up to meet the menacing cloud of liquified gas. They reached it,
sped into it, glowing feebly! The white cloud did not ignite, but fell
on toward the boat. It reached and enveloped the little vessel, and
suddenly the guns were still.

"Damn him!" said Teddy in a voice that shook with rage. "He's not using
hydrogen. We can't close in on him now. Our flares are no good."

Davis tilted the nose of his machine upward, and Teddy stared down his
sights. He pulled the trigger. The gun kicked backward, but the recoil
cylinders did their work. The tracer shell left a little line of smoke
behind it. It passed below the black body.

"Too low," said Teddy grimly, and fired again.

Varrhus began to climb. Straight up his machine went, but with the
picric acid giving added impetus to the explosions in the cylinders the
two-seater climbed as rapidly. Varrhus' ascent swerved. He was directly
over the aëroplane. A whitish cloud appeared below his machine and
blotted it out for an instant.

"We zoom," said Davis almost gayly, and the fighting plane seemed to
be dancing on its tail for an instant. The cloud of gas unfolded itself
down to the surface of the water, barely twenty yards before the space
in which Davis had checked his course.

Around and around a huge circle. The biplane had caught up with the
black flyer, and Davis turned toward it for an instant to give Teddy
an opportunity to fire. There was a flash at the stern of the slender
black body, and the symmetry of the glistening form was marred by a
ragged edge where the tip of the tail had been blown off.

"Almost," said Teddy grimly.

"He'll dive now."

Davis was prepared for the maneuver, and almost as soon as the
helicopter began to drop the biplane darted down after it, Teddy firing
viciously. The streaks of smoke that his shells left behind them told
him where he missed. Varrhus shifted the course of his fall, and again
a cloud drifted in the air just before the pursuing plane. Davis flung
the "joy-stick" forward, and the fighter fell into an absolutely
vertical dive. A second more and it had turned upon its back and was
flying upside down, away from the threatening mist.

Davis twisted in mid-air and righted his machine. Varrhus was darting
away, barely two hundred feet above the surface of the water. Again the
two-seater dived upon him. Teddy's shells were zipping dangerously near
the black machine. It began to zigzag, to twist and turn like a snake.
It doubled back and shot directly under the biplane, but too far below
for the deadly mist to be used. Davis banked at a suicidal angle and
went after it again. They passed directly above the silent small boat,
drifting aimlessly on the waves. Little icicles were forming on the
bulwarks, showing that the cold of the liquified gas was still intense.

For one instant Teddy had a perfect sight, and pulled the trigger with
the peculiar confidence of a marksman who knows he is making a perfect
shot. There was a flash upon the upper portion of the black hull. A
dark object shot off at a tangent from one of the whirring disks. The
helicopter sank rapidly. Teddy gave a shout.

"Landed!"

The black machine recovered again. One of the disks was badly injured
and now slowed and stopped, showing that the blade of one of the
four sustaining propellers had been broken, but the remaining three
increased their speed. Varrhus seemed to abandon the idea of fighting.
He began to shoot away toward the northeast. He was more than a mile
away, and Teddy had stopped firing. Varrhus had had no difficulty in
distancing the same machine a week before, and anticipated no trouble
in losing it, even with his own flyer partially crippled. He had not
reckoned on the picric compound now being used for fuel. The biplane
sped madly after the fleeing black aircraft. The motors roared hugely,
and the wind was like a solid mass, pushing fiercely against Teddy's
exposed head. A small half-moon of glass protected Davis from the wind,
but for the gunner no such protection was practicable. The rushing of
the wind through the wires and along the sides of the stream-line body
amounted to a shriek. Never had such speed been known before.

Davis' voice came quietly to Teddy above the sounds outside, muted by
the heavy, padded helmet. The telephone receivers were fast against
Teddy's ears.

"We're making two hundred and twenty-six."

"We're not gaining," said Teddy grimly.

"Wait until he rises. The motor's adjusted to be most efficient at
about seven thousand feet."

The black speck ahead of them was drawing no nearer, it is true, but
it was not dwindling. The silvery wings of the biplane cut through the
air with fierce impatience. It flew in the straightest of straight
lines after the other craft. Dark-brownish smoke blew backward from the
bellowing exhausts, tinged almost to saffron by the presence of the
explosive acid. The sunlight kissed the upper surfaces of the wings of
the pursuing plane. Below them the ocean rolled and tossed.

Whistling wind and roaring engines. Speed, speed, speed! The biplane
rushed with incredible swiftness through the air. The black flyer
skimmed lightly on, barely in advance of its white-winged enemy. Twice
Teddy essayed a shot, but the biplane trembled so that accuracy was
impossible, and he could see by the smoke of his tracer shell that he
had gone far wide of the black machine. The space between the black
speck and the waves below it seemed to increase.

"Rising," said Davis. "Now we'll get him."

Teddy kept his eyes fixed on Varrhus' slender, needlelike craft. He
was barely conscious of the upward tilt of the machine in which he was
riding, but he saw that they were keeping pace with Varrhus as he rose
in the air.

"Four thousand feet," said Davis crisply. "And two hundred and
twenty-nine miles an hour. There's land ahead."

Teddy saw a mountainous coast line becoming visible far away. The black
flyer continued to rise.

"Six thousand feet," said Davis again, "and two hundred and thirty-two
miles----"

The pilot of the other machine saw that they were gaining. He dropped
abruptly.

"Now!" exclaimed Davis fiercely.

He dived downward. The descent, coupled with the immense power of the
engines--now delivering vastly more than the eight hundred horse power
for which they were designed--made them shoot toward the black flyer
with increasing speed. The other machine was barely more than half
a mile away and every detail of its construction was visible. Teddy
noticed for the first time a slender tube rising between the two center
sustaining propellers. He instantly leaped to the conclusion that it
was the means by which the jets of liquified gas had been shot out. He
fired.

"A hit!" cried Davis.

There had been a flash from the top of the cabin. A jagged rent
appeared in the polished roofing, and the slender tube vanished. The
black flyer seemed to abandon all hopes of escape. It sped madly for a
gap between two of the tall mountains that rose along the coast line.
At the unprecedented speed with which both machines had been traveling
the coast seemed fairly to rush at them. No villages were visible,
but it seemed to be a habitable, if not an inhabited, land. The black
flyer swept on across country, Varrhus evidently making every effort to
gain even a few yards on his adversaries, and Davis just as fiercely
determined that he should not. Once, twice, three times Teddy fired.

A smoothed and inclosed field, almost surrounded with small buildings,
appeared. Varrhus dashed toward it desperately, the white-winged
biplane vengefully after him. The black flyer dropped like a stone and
the biplane dived straight for it. In that last dive Teddy worked his
one-pounder as coolly as if at target practice. Flash! Flash! The black
flyer crumpled and fell the last fifty feet as an inert mass.

Teddy jumped from the biplane as it flattened out and settled to the
ground. With his automatic pistol drawn and ready, he darted toward
the partly wrecked black machine. As he drew near a sallow face came
weakly to a window of the cabin. An automatic flashed from beside the
face and Teddy heard a queer sound and a fall behind him. He did not
stop, but rushed on, shooting viciously at the face in the opening. He
reached the wreck, wrenched open the door, and swung into the cabin
with utter disregard for danger.

A tall, lean, sallow man was sitting exhausted in the pilot's seat
of the black flyer. His right arm was crimsoned from a wound in his
shoulder, and blood spurted in little frothy jets from a second wound
in his neck. Teddy's fire had been better directed than he knew. As
he entered with pistol ready, the sallow man raised his head erect by
a tremendous effort. A hooked nose, a merciless mouth, and blazing
eyes filled Teddy with repulsion. The sallow man stared at him
superciliously.

"I am Wladislaw Varrhus, dictator of all the earth," he said in a
metallic voice. "I command--I--command."

Speech failed him. His head dropped and he fell limply from the
cushioned seat.




CHAPTER XI.


Teddy felt the fallen man's breast, but he was not breathing. In any
event there was nothing that could have been done for him. An artery
had been cut by a splinter of the one-pounder shell that had smashed
the roof, and he had bled quietly to death, only trying desperately to
land and get assistance before he died. The sight of Teddy and Davis
sprinting toward him with drawn pistols had been too much for his
hatred, however, and he had fired his automatic at them even as he was
dying. Teddy found Davis lying on the ground with a bullet in his hip.

"I'm all right, Gerrod," said Davis cheerfully when Teddy went to him.
"Just see if there are any more chaps in these houses before you bother
with me."

Teddy explored the place thoroughly. There were many signs of human
occupancy, but no one save Varrhus himself had been there when they
landed. He returned to Davis to find him weakly trying to improvise
a pad to stop the bleeding. Teddy lifted him and carried him to the
house that seemed to be most used. In a little while Davis was quite
comfortable and contented. He lit a cigarette and calmly began to read
one of the newspapers that littered the place, while Teddy continued
his explorations.

The landing field was a small one, no more than a hundred and fifty
yards long by seventy-five wide. At one end was an unpretentious but
comfortable dwelling, in one of whose rooms Davis was at that moment
resting. At the other end a shed evidently formed the hangar for the
black flyer. Along the sides of the inclosure were long sheds, some of
them empty, some containing supplies of various sorts. Half a dozen
cold bombs, complete except for the mysterious treatment of their
surface that gave them their strange property, lay on the floor of one
of the sheds along the sides. Another shed, long disused, had provided
quarters for workmen. Teddy found the single exit that led from the
inclosure. It opened on the wide hillside and afforded a view of miles
without a sign of human habitation. The remnant of a wheel track that
had obviously not been traveled for months led away from the door.
Along that primitive road the materials for building the inclosure and
the black flyer had evidently been brought. Teddy went back to Davis.

"Gerrod," said Davis amiably, "I'm a fake. I'd lost quite some blood,
you know, and I was pretty weak, but while you were gone I saw a small
black bottle on a shelf over there, and I managed to crawl over to it.
Wherever we are, prohibition hasn't struck in, and I took just enough
to feel all right again. I believe I can drive back. It wasn't more
than a two-hour drive anyway, was it?'

"Between two and three," said Teddy, smiling. "We were making terrific
speed, though. We're probably in Newfoundland somewhere."

"Or Iceland. To tell the truth, I'm quite indifferent. Suppose you help
me out to the machine again."

"I want to see what I can find in the laboratory first," said Teddy.

The laboratory was of the smallest. Whatever experiments had been
necessary to perfect the cold bombs and the black flyer had been made
elsewhere. Teddy found a number of notebooks, which he took. He found
many chemicals, some in considerable quantities, in receptacles about
the laboratory, but no clew to the mysterious process that had enabled
Varrhus to threaten the world's security. He left Varrhus where he
lay. Both he and Davis confidently expected to return and investigate
thoroughly both the cold bombs and the black flyer. Davis, especially,
was anxious to examine that strange machine in detail, but his wound
was painful and he wished to have it properly dressed. Besides this,
the whole world was waiting anxiously to learn its fate, whether
Varrhus' ambitious plans were to be frustrated or whether it would have
to put its neck beneath the heel of the mad dictator.

Teddy lifted Davis in the machine, and after some difficulty they
started off. Davis circled above the small clearing until it was tiny
beneath them.

"Course is southwest," he remarked to Teddy. "We'll notice where we
land and then a northeast course will bring us back here again or
nearly."

"Right," said Teddy abstractedly. His mind leaped ahead to the moment
when he would see Evelyn again. He had seen her just before starting
for Noman's Reef and she had seemed pale and anxious. He was not sure,
but he hoped he was right in believing that she was more anxious than
she would have been had she looked on him merely as a friend or comrade.

The biplane sped over the sea across which it had flown in such
desperate haste that morning. Davis was weak, but for straightaway
flying modern machines need but little attention. The new inherently
stable aëroplanes are so safe that an amateur could pilot one in
midflight. And Davis had taken a small quantity of stimulant to
supplement his strength. At that, however, his endurance was severely
taxed before he flattened out and taxied across the landing field on
Staten Island. Mechanics rushed out to greet him and help him from the
machine.

"Varrhus is dead and the black flyer is smashed," said Davis
cheerfully, and incontinently fainted.

Teddy made a hasty report to the commandant of the forts and rushed
to New York. The second cold bomb had exploded that morning and the
city was panic-stricken, but as his taxicab sped uptown the extras
began to appear announcing the removal of the menace to the world. The
frightened crowds changed to happy, cheering ones. If Teddy's identity
had been suspected as he passed swiftly through the streets, he would
never have gotten through. He would have been dragged from the motor
car to be cheered and recheered. As it was, he made his way quickly to
Evelyn's home.

He sprang up the steps and burst open the door, not waiting for the
servant to open it. As he rushed into the hall, Evelyn came into it
through an open door. She saw him, and her face was suffused with joy.

"You're safe!" she cried joyfully, and burst into happy tears.

Teddy took her quite naturally into his arms and held her there a
moment. She sobbed quietly on his shoulder for a second, clinging
to him, then pushed him away and stared at him while a hot flush
overspread her face.

"Oh!" she exclaimed in a rush of shame. "I--I----" She turned and ran
away. Teddy caught her.

"What's the matter?" he demanded. Her cheeks were still crimson.

"I--I kissed you," she said desperately, "and you--you hadn't said----"

Teddy laughed happily. "I hadn't said I loved you? Well, if that's all
that's bothering you, just listen." And Teddy said it several times.

Davis was up and about in less than a week. His wound had been of
little importance, and with a crutch which he took pride in using with
dexterity he was able to move around almost as well as ever. He came
over to tea with Evelyn one afternoon. Teddy was there, too, of course.
Davis was boyishly showing off how well he could move about Teddy
watched him critically.

"That's all right, Davis," he said in a paternal tone, "but you want to
get rid of that instrument as soon as you can."

"What for?" demanded Davis, deftly swinging himself into a chair.

"We're waiting for you to get well," explained Teddy, with a smile at
Evelyn. "It isn't considered good form to have a groomsman who's a
cripple."

"Groomsman? Who? What? You two?" Davis stared from one to the other.

Teddy nodded, and Evelyn turned slightly pink. Davis turned to Teddy.

"They tell me you and I are to be impressively decorated for smashing
Varrhus," he complained, "and there'll be moving pictures taken of it
and shown everywhere. I want to be a touching picture, all wounded up,
you know, when that happens. A girl threw me over about six months ago
and she likes the movies. When she sees me beautifully mangled and
being kissed by bearded people who pin medals on me she'll be sorry.
Mayn't I wear a crutch until then?"

Teddy laughed, and Evelyn smiled affectionately at Davis.

"If it's like that, of course," said Evelyn, "we'll wait. But Teddy's
in an awful hurry."

"I would be, too, in his place," said Davis promptly. He assumed an
expression of extreme reluctance. "Well, I suppose I'll have to get
well."

Teddy shamelessly squeezed Evelyn's hand, and she as shamelessly
squeezed back.

"There are compensations for having to wait," said Teddy generously,
"provided, of course, it isn't too long."

Davis looked at them and his eyes twinkled.

"Well, then, in that case----" He started for the rear of the house.

"Where are you going?"

Davis looked over his shoulder with a grin.

"You people compensate each other for waiting," he said amiably. "_I'm_
going to go out in the laboratory and kiss the galvanometer."





End of Project Gutenberg's A Thousand Degrees Below Zero, by Murray Leinster