TWINS ***



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                                 REPORT

                                   OF

                        AN AUTOPSY ON THE BODIES

                                   OF

                         CHANG AND ENG BUNKER,

                         COMMONLY KNOWN AS THE

                             SIAMESE TWINS


                                   BY

                         HARRISON ALLEN, M.D.,
   PROFESSOR OF COMPARATIVE ANATOMY AND ZOÖLOGY IN THE UNIVERSITY OF
        PENNSYLVANIA, SURGEON TO THE PHILADELPHIA HOSPITAL, ETC.




                             PHILADELPHIA:
                  COLLINS, PRINTER, 705 JAYNE STREET.
                                 1875.




                     AUTOPSY OF THE SIAMESE TWINS.




[Illustration Figure 1:

  Fig. 1.   The twins in the acquired position (E. R., C. L.). From a
            photograph taken in St. Petersburg, 1870. ]




                                 NOTE.


The word “Report” used in the title of my paper is to be read as
referring to the post-mortem appearances only, and not to the
Report of the Commission as appointed by the College. The
ante-mortem history prefixed to my paper was written in
conjunction with Prof. Pancoast.

                                                        H. ALLEN.




                                 REPORT

                                 OF AN

                 AUTOPSY ON THE BODIES OF CHANG AND ENG
                     BUNKER, COMMONLY KNOWN AS THE
                             SIAMESE TWINS.

                                   By

                         HARRISON ALLEN, M.D.,
     PROFESSOR OF COMPARATIVE ANATOMY AND ZOÖLOGY IN THE UNIVERSITY
      OF PENNSYLVANIA, SURGEON TO THE PHILADELPHIA HOSPITAL, ETC.

                         [Read April 1, 1874.]

                                -------




                          ANTE-MORTEM HISTORY.


Chang and Eng Bunker were born near Bangkok, Siam, in 1811, their father
being a Chinaman, their mother a native of Siam, bred by a Chinese
father.[1]

-----

Footnote 1:

  For this statement see an article in Lippincott’s Magazine, March,
  1874.

-----

The twins were united by a band extending from the junction of the
abdominal and thoracic cavities, anteriorly, constituting the variety in
teratology known as _Omphalopagus xiphodidymus_.

They were married in April, 1843, and raised large families; Chang
having had ten, and Eng twelve children. Chang had three boys and seven
girls; Eng had seven boys and five girls. These were in all respects
average children, excepting two, a boy and girl of Chang’s, who were
deaf-mutes.

The twins resided in a rolling country, about four miles from Mount
Airy, Surrey Co., N. C. They were prosperous farmers, each owning his
own farm. The dwellings of the two families were a mile and a half
apart. The twins resided three days in each of the homes alternately.
They were expert in the handling of tools, in plowing, shingling,
shooting, etc. They lived much in the open air, and frequently drove in
a carriage to the neighboring village.

The events leading to their death were as follows: About six years ago
Chang, who had always been the more excitable, became addicted to
immoderate drinking. Three years ago, while on a voyage from Liverpool
to New York, he was stricken with hemiplegia of the right side. He in
great measure recovered from this attack, but could never ascend and
descend stairs with facility. For this reason the twins occupied rooms
on the ground floors of their homes.

On Monday evening, Jan. 12th, 1874, Chang was seized, while at his own
house, with an attack of bronchitis. He had a cough; scanty, frothy
sputa; but no pain. On Wednesday the symptoms had somewhat subsided; the
skin was acting freely. Loud bronchial râles were present over the left
side of the chest. On Thursday evening the twins insisted upon leaving
Chang’s house for Eng’s. The weather was very cold, and the journey was
undertaken in an open carriage. On their arrival, however, Chang
continued as well as before, until Friday evening, when he complained of
thoracic oppression and inability to lie down with comfort. After having
retired that evening, the twins were heard to get up, and go out on the
porch, by the side of the house, where they drank of water, and returned
to their room. They built a large wood fire, and sat down; Eng soon
complaining of being sleepy, Chang declaring that he could not breathe
if he should lie down. Finally they again retired. They both fell
asleep. Near daybreak (Jan. 17th) Eng called to one of his sons, who
slept in a room above, to come down and waken Chang. The boy soon made
his appearance, and going to the side of Chang, cried out, “Uncle Chang
is dead!” Eng at once said “Then I am going!”—It is probable that Chang
was sleeping when he died.

Eng made no further mention of Chang other than to request that the body
be moved closer to him. Soon afterward Eng desired to have his limbs
moved. This desire continued for half an hour. He then asked for a
urinal, but did not void over a few drops of urine. He several times
repeated the endeavor to micturate, but without success. He then
complained of a choking sensation, and asked to be raised in bed. He had
continued rational. His last words were “May God have mercy on my soul!”
He gradually became fainter, fell into a syncopal state, and died
quietly a little over two hours from the announcement to him of the
death of his brother.




                                AUTOPSY.


The Autopsy was begun in the house of Eng, Sunday, February 1st, 1874,
and finished in the Mütter Museum of the College of Physicians, at
Philadelphia.

Age of subjects, 63 years. Examination made about fifteen days and eight
hours after death. The weather had been cold. No preservative had been
employed prior to the date of the autopsy.


                      I. Post-mortem Appearances.

The following is their description in Chang.

Body moderately emaciated. _Rigor mortis_ none. The fingers of the right
hand were semi-flexed, a condition due doubtless to the long-standing
paralysis of the right upper extremity. Passive congestion was marked
over entire dorsal aspect of the neck, trunk, and upper extremities. It
was less marked over the corresponding surfaces of the forearm and legs.
The feet and hands were almost entirely free. The superficial veins in
the last-named localities, especially in the left foot, were distended.
The passive congestion extended over the right thoracic region as far as
the median line, and on the front of both thighs, especially the right.
Upon the head the congestion was seen behind and beneath the ears, and
was sparsely distributed over both malar prominences. The lips were
discolored. The integument of the genitals was infiltrated, the scrotum
particularly being much swollen. There was extensive greenish
discoloration on the anterior abdominal wall. The left external
abdominal ring was enlarged. Both testicles were within the scrotum. The
hair of the head was gray. That on the right side of the pubis was
black, that on the left was of an iron-gray color.

The following is their description in Eng.

Body moderately well nourished, spare. _Rigor mortis_ slight. Passive
congestion less marked than in Chang. It was most conspicuous on the
buttocks and infraspinous spaces. There was none in front of the body.
The testicle of left side absent from scrotum. There was moderate
greenish discoloration of anterior wall of abdomen. The hair on the
pubis was black on the right side, pure gray on left side of the median
line.

_Measurements._—Chang was 5 ft. 2-1/2 in. in height; Eng, 5 ft. 3-1/2
in. When the bodies were laid upon a table Chang’s left side and Eng’s
right side were drawn somewhat toward one another. This was most marked
in Chang, and gave a greater inclination of his trunk toward his
brother’s. (See Figs. 1 and 19.)


                 II. External Appearances of the Band.

When the bodies were suspended and placed face to face, it was evident
that the congenital position had been secured. All observations were
made, as far as was possible, with the bodies in this position. With it
the details of structure, it was thought, could be easily understood;
without it the subject would be difficult and confused.

The “band” was a massive commissure placed between the bodies at the
junction of the abdominal and thoracic regions of each. It was broader
above than below, and had a circumference of nine inches. It presented
four surfaces for examination, an upper, lower, and two lateral
surfaces.

The _upper_ surface was somewhat flattened in both Chang and Eng. The
ensiform cartilage of each body could be felt deflected from the sternum
and prolonged into the band. The base of the cartilage in Eng presented
a rounded circular eminence, measuring one inch in diameter. There was
no corresponding eminence in Chang. The upper aspect of each process
could be well defined beneath the skin, the subcutaneous connective
tissue being more abundant in Chang than in Eng. The upper surface
measured 2-1/2 in. in width at its base towards Eng, and 2-1/3 in. at
its base towards Chang. It was 2 in. wide at its middle.

[Illustration Figure 2:

  Fig. 2.   The twins in the acquired position (E. R., C. L.), showing
            band and the primary incisions, _a-b_, _c-d_. From a
            photograph taken after death at Philadelphia. ]


The _lower_ surface was much narrower than the upper. It was marked in
the centre, but nearer the anterior than the posterior border, by a
linear scar one inch in length, which it was thought answered to the
position of the single umbilicus. The skin was adherent at this point,
but elsewhere was easily raised in folds. Behind the scar, _i. e._,
toward the posterior part of the band, the skin was somewhat corrugated.
This portion answered, in position, to Chang’s umbilical pouch.

The _lateral_ surfaces. The terms _upper_ surface and _lower_ surface
have fixed values, no matter how they may be approached by the observer.
This is not the case, however, with the lateral surfaces, as will appear
from the following considerations. Viewing the band as a separate
form—as it was spoken of during the life of the twins—we will see that
the terms front (“anterior”) and back (“posterior”), as given to the
lateral surfaces, were derived from studying the acquired position. Thus
we were bound not to cut the “front” of the band, but allowed to make an
incision on the “back.” Now this position of selection was destroyed,
and its terms deprived of what meaning they may have had, by the
reproduction of the congenital relations of the bodies.

There is no doubt that in infancy and early childhood there was no
acquired position, and, therefore, neither “front” nor “back” to the
band. And later, when, as we have reason to believe, the position of
selection was gradually adopted, the terms “front” and “back” were
reversible—the “front” meaning that which corresponded to the surface of
least thoracic approximation. Thus when the adult condition was fixed,
and the “front” answered to the widely separated right side of Eng’s
chest and left side of Chang’s chest, the “back” was in relation with
the closely approximated left side of Eng’s chest and right side of
Chang’s.

To avoid awkward repetition of phrases expressing the facts of the last
sentence, the following characters will be employed in describing the
“lateral” surfaces of the band.

E. R., C. L. (Eng’s right, Chang’s left) will designate the “anterior”
surface of the acquired position. C. R., E. L. (Chang’s right, Eng’s
left) will designate the “posterior” surface. Since the right side of
Chang’s half of the band merged into the left on Eng’s half, while the
right side of Eng’s half, after it passed the middle line, became the
left half of Chang’s, we propose using the characters E. L., E. R., and
C. R., C. L., which will be understood as signifying left side Eng,
right side Eng, etc.

Using the above signs we found that the surface E. R., C. L. was
inclined decidedly downward and backward when seen in the congenital
position, and was 3 in. high and 2-1/2 in. wide. At E. R., the border
answering to the ensiform cartilage was marked by a large rounded
tubercle; it was much more pronounced than on the corresponding border
of C. L. When seen in the acquired position, E. R., C. L. became
“anterior,” when, at its upper margin, C. L. was longer than E. R. by
one-half inch. The tubercle on E. R., already noticed, was much more
prominent than C. L. The contour of the inferior margin was also
different, being more uneven. C. L. was not only longer, but was more
obliquely placed downward and outward to the centre of the band than E.
R. (See cast in the Mütter Museum.)


                      III. Coverings of the Band.

In front (E. R., C. L.) the superficies could not be well examined owing
to the restrictions imposed by the families. A view of it from within
can be obtained in Figs. 8, 9, _q. v._ Permission having been granted to
make an incision “behind,” at C. R., E. L., a modified letter-H incision
was employed, thus—

                             a  \       / e
                              b  >—————< d
                             c  /       \ f


Turning the skin flaps here indicated upwards and downwards, and the
lateral triangles outwards, there was found beneath, a layer of
superficial fatty connective tissue, with a well-defined layer of fat on
either side, but with an intermediate portion which was free from fat,
and of greater thickness.

The skin could with some little trouble be raised over the _dorsal or
upper surface_, showing here entire absence of fat. A very delicate
artery was found running across the middle, from Eng to Chang.

The lower portion of the surface C. R., E. L. was inseparably connected
with the umbilicus. It was also united to the superficial fascia on C.
L., about 1-1/2 inches from the umbilicus; this did not have any
connection with the deeper parts. The process of fibrous tissue which
had been felt through the skin was conspicuous on this surface of the
band, and was covered by a delicate non-fatty layer of connective
tissue. Towards the lower part of the surface were seen several
diverging lines of fibrous tissue, which were lost within the integument
about the umbilical scar, at the lower surface of the band. They were
exceedingly thin, and at one point lay directly over the posterior and
inferior wall of the umbilical pouch of Chang.

[Illustration Figure 3:

  Fig. 3.   The surface, C. R., E. L., exposed by removal of skin and
            superficial fascia to display the tendons of the external
            oblique muscles and adjacent parts.

       A.   The superficial fascia—lost over the position of Chang’s
            umbilical pouch.

    B, C.   Supplemental layers of fibrous tissue of Eng not seen in
            Chang; B is a continuation toward Eng of aponeurotic
            fibres having a source from the linea alba of Chang; C is
            independent of the former, and is continuous with the deep
            pectoral fascia.

       D.   The interlacing of fibres on tendon of external oblique
            muscle of Chang.

       E.   The linea alba of Chang, beginning at C. R.

       F.   Its continuation to E. L., and insertion upon the ensiform
            cartilage. ]


Turning down the superficial layer, the aponeurosis of the external
oblique muscle was exposed (Fig. 3). A marked contrast was exhibited in
the two sides of the band. In Chang the parts were normal so far as they
were exposed—the characteristic apertures for the escape of small
vessels being abundant and conspicuous. In turning down the superficial
fascia in Eng (Fig. 3, A), it was found to be continuous at its lower
portion with an aponeurotic layer (Fig. 3, B), which extended toward the
median line, where it was continuous with the linea alba of Chang. In
addition to this, a second layer (Fig. 3, C), analogous in position to a
deep layer of the superficial fascia, which was entirely independent of
Chang, extended over nearly the whole of Eng’s division, and was
particularly well defined over the fibres of origin of the external
oblique muscle. This was continuous with the deep layer of the
superficial fascia which passed over the entire side of Eng’s thorax.

Toward the middle of the band this layer gradually lost its distinctive
features, and was firmly incorporated with the tendon of the external
oblique muscle. A number of fibres corresponding to it extended in
inseparable intimacy with this tendon. These were gradually lost as they
approached the linea alba of Chang, and the parts being in position
these fibres were at their lower portion covered in by the aponeurotic
extension of the linea alba already mentioned.

On Chang’s side, as we have seen, the parts comparable to these
accessory layers were absent. There was no line of demarcation between
the tendon of the oblique and the aponeurotic attachment of the
pectoralis. The tendon of the external oblique presented a different
appearance from the normal one in a more extensive interlacing of fibres
of the linea alba with the tendon.

The part termed above the linea alba of Chang (Fig. 3, E), has already
been indicated through skin and superficial fascia. As can be seen, this
band of fibres, having its origin from the middle line of the abdomen of
Chang, was found to be a direct continuation of the linea alba. It was
remarkable in not being inserted into the ensiform process of Chang, but
into that of Eng, and in giving off the aponeurotic outshoot B, already
noticed, as well as in having a diffused point of insertion into Eng’s
tissue as in the ensiform cartilage (F). In a word, the linea alba
approaches the surface C. R., E. L. from C. R. below, and is inserted
into E. L. above.


  IV. Organs Of Abdomen as observed in position through the Incisions.

Limited incisions being alone permitted, the large vessels of the
abdomen were sought for in the process of embalmment, believing, as we
did, that the procedures of securing them would enable us, by extending
the cuts from below upward, to fairly open the abdomen and examine
thereby the interior of the band.

In each body, therefore, an incision six inches long (Fig. 2, _ab_,
_cd_) was extended from the centre of the right iliac region to the
centre of the right hypochondriac region. This was subsequently joined
by an oblique incision passing from the upper end of the first mentioned
to the lateral border of the ensiform cartilage at its base. This
incision measured 7-1/2 in. The lower end of the vertical incision was
met by a horizontal one passing to the centre of the hypogastric region,
and measuring 3-1/4 in.


Through these incisions were studied (1) the _umbilical ligaments_ and
(2) _the abdominal viscera_.

1. _The umbilical ligaments._[2]—By turning forward the anterior flap in
Eng as far as possible, the peritoneal lining was exhibited, and there
was brought into view a structure beginning at the summit of the
bladder, and which, ascending the abdominal wall and passing obliquely
to the right side, could be traced clearly to the scar-like tissue
marking the remains of the umbilical structures situated upon the
anterior abdominal wall within about 1-1/2 in. of the band. This
structure was the umbilical ligament (Fig. 4, A). It was loaded with
fat, and, as it terminated at the scar, distinct lobules of fat (several
of which were pedunculated) were abundantly deposited.

The bladder was distended and raised 5 in. above the pubis.

-----

Footnote 2:

  The folds of peritoneum containing remains of the hypogastric arteries
  will be called throughout by the name of _the umbilical ligaments_.

-----

[Illustration Figure 4:

  Fig. 4.   The umbilical ligament in Eng.

       A.   The umbilical ligament.

       B.   The lobule of fat at position of the normal umbilicus. ]


In Chang (Fig. 5), the same appearances were seen as those above given,
save that no fat was deposited in the umbilical ligament. On the
contrary, it resembled the omentum of an emaciated subject. When
stretched, the fold was fully an inch wide, quite transparent, and
marked by two longitudinal bands, which recalled the shapes of the
obliterated vessels. But two rather small sessile fatty appendages were
seen at the scar.

The bladder was empty, contracted, and lay within the true pelvis.

[Illustration Figure 5:

  Fig. 5.   The umbilical ligament in Chang.

       A.   The umbilical ligament.

       B.   The lobule of fat at position of the normal umbilicus. ]


In both Chang and Eng an isolated mass of subperitoneal fat, presenting
a sub-circular form, and measuring 1 in. in diameter, was found in the
position of the normal umbilicus (Figs. 4 and 5).

2. _The viscera._—In Eng the omentum was gathered up toward the
transverse colon. It was abundantly furnished with fat.[3] The
transverse colon extended across the abdomen, beginning on the right
side on a level with the eleventh rib. It was contracted and contained a
little flatus. The rest of the exposed region was occupied by coils of
small intestine, yielding a mesentery very rich in fat. The stomach was
not visible. By removing the small intestine, and bringing down the
transverse colon and large intestine, the pyloric extremity of the
stomach was seen. The fundus of stomach, spleen, and left kidney were
not seen. (Fig. 6.)

-----

Footnote 3:

  The presence of a great amount of adipose tissue throughout, in Eng,
  was very noticeable as contrasted with the emaciated appearance of the
  tissues in Chang.

-----

[Illustration Figure 6:

  Fig. 6.   The abdominal organs in Eng—the small intestines removed.

       A.   Left lobe of liver.

       B.   Right lobe of liver.

       C.   Gall-bladder.

       D.   Suspensory ligament.

       E.   Lobules of fat in the position of the termination of the
            umbilical ligament. ]


_The liver._—The right lobe was alone visible. This extended entirely
across the right hypochondriac and epigastric regions. Its external free
border was not in contact with the ribs. Between it and the external
abdominal wall there was an interval of nearly an inch at its greatest
part, which was crossed by the external lateral ligament. The inferior
border of the lobe rested upon and nearly concealed the pylorus of the
stomach as well as the upper half of right kidney. Corresponding in
position to the upper portion of the right kidney was a well-defined
layer of peritoneum, presenting a sharply defined internal border. Upon
dissecting away the peritoneum from this border it was found to answer
to the inferior vena cava. The lesser omentum occupied its usual
position. The fundus of the gall-bladder was two-thirds of an inch
beyond the anterior border of the lobe, immediately to the outer side of
the caudal lobe. The position of the longitudinal fissure was well off
to the left side of the abdomen, presenting, between the right and left
lobes, a conspicuous cleft which was partially occupied by the base of
the caudal lobe. The round ligament, with its associated suspensory
ligament, had doubtless passed nearly vertically, before the relations
had been disturbed by the incision in the abdominal wall, upwards and
forwards to the anterior abdominal wall at a point lying one inch to the
outer side of the centre of the umbilicus.

In the subject, as it lay on the table with the flap _a, b_ (Fig. 2),
turned to the left, the suspensory ligament had the appearance of being
much more obliquely inclined to the left, and could be made nearly
horizontal by a little traction. Lying beneath this ligament, but
belonging to the anterior abdominal wall, was a large mass of
subperitoneal fat about the size of a pigeon’s egg. Extending to the
extreme left, and continuous with the anterior border of the left lobe
of the liver, was a delicate prolongation of liver substance which was
lost within the connecting band.

[Illustration Figure 7:

  Fig. 7.   The abdominal organs of Chang in position—the small
            intestines removed.

       A.   Left lobe of liver.

       B.   Right lobe of liver.

       C.   Gall-bladder.

       D.   Suspensory ligament.

       E.   Lobules of fat in the position of the termination of the
            umbilical ligament. ]


The upper surface of this prolongation was supported by a fold of
peritoneum, extending directly upward, apparently attached to the base
of the ensiform cartilage. Visible upon the anterior aspect of this fold
was a tortuous artery, afterwards found to be the left internal mammary.
This fold may be called _the accessory suspensory ligament_; nothing
similar to it was seen in Chang. The left lobe of the liver, save a
portion of its anterior edge, was not visible.

In Chang (Fig. 7), by exposing the parts as in Eng, throwing the
abdominal flap, _c, d_ (Fig. 2), to the right, there was at once brought
into view the transverse colon, the greater omentum, and greater
curvature of the stomach. The latter organ was large, empty, and without
any undue traction could be so displayed as to yield its fundus and
greater curvature in position. The fundus was not visible. Lying
conspicuously within the left hypochondriac region was the spleen. Its
inferior free border, with its peritoneal attachment, was distinctly
seen; its upper portions, however, were invisible. The left lobe of the
liver held a position answering to that of the right lobe in Eng—the
external lateral ligament being stretched across the left hypochondriac
region, pursuing a similar course to the external lateral ligament of
Eng (_q. v._). The left lobe at its outer portion rested upon the
spleen, its inner portion upon the stomach. The outer portion of the
left lobe presented a thin compressed border, the inner portion was
divided by a deep sulcus into two lobes.

The right lobe lay deep within the right hypochondriac region, the
portion about the longitudinal fissure anteriorly, alone appearing in
the dissection. The suspensory ligament held a position similar to that
in Eng. The gall-bladder held its normal position to the right lobe, and
was moderately distended with bile.

Both Chang and Eng had the organs occupying the hypochondriac and
epigastric regions retaining, on the whole, such relations as are
usually observed.

This statement appears pertinent, at this stage of the autopsy, in order
to explain—


                          V. Interior of Band.

We here describe (1) _the hepatic pouches_; (2) _the umbilical pouches_;
(3) _the vascular structures of the band_; (4) _the diaphragms_; (5)
_the ensiform cartilages_.

1. _The hepatic pouches._—The photograph (Fig. 2) indicates the position
of the right lobe of Eng’s liver in the right hypochondriac region. The
right lobe of Chang is of course not seen in the figure, since it lies
on the side of the body which is not in the field of vision. It must
follow from the rights and lefts of the two individuals being opposites
that, in drawing a line between the livers (which, as already seen,
occupy normal positions as to right and left) across the band, such a
line will be diagonal to the axes of the ensiform cartilages; Chang’s
half of the band having the line enter the band from his “right,” Eng
from his “left.” It will also follow that any pouches of peritoneum
which might accompany this line will pursue a similar direction—be on
the same plane—be right or left with respect to the axis of that plane.
Now it was actually demonstrated that such a line did extend between the
livers, and was accompanied by such peritoneal pouches. These pouches
were termed the hepatic pouches, and may be described as follows:—

Chang.—The subject lying on the table with rights and lefts determined
as in the acquired position, the finger could be inserted behind the
suspensory ligament (Fig. 7) in a pouch lying directly beneath the
ensiform cartilages, into which passed an extension of liver-like
tissue.

Eng.—This fact could not be well demonstrated in Eng in this position,
but is well seen in Fig. 8.

It follows that the two hepatic pouches are on nearly the same plane,
and that each approaches the central point of the band diagonally from
the right side of the subject with whose abdominal cavity it is
continuous.

2. _The umbilical pouches._—Beneath the hepatic pouches, and between
them and the inferior border of the band, were two pouches which, from
their association with the round ligament, have been termed _the
umbilical pouches_.

When the finger was passed toward the band from the abdomen of Chang,
and following the peritoneum of the anterior wall of the abdomen, it
passed into a pouch of the band directly over the skin covering, across
the band, over the umbilicus, and was received within the folds of the
suspensory ligament of the liver of Eng. This pouch was so superficial
that while the finger was in the pouch any motion of the finger was
readily followed by the observer.

In the same way as above, if the finger was introduced _behind_ the
suspensory ligament of Eng, it slipped into a pouch which passed across
the median line of the band, and was received within the folds of the
suspensory ligament of the liver of Chang.

There were then two pouches communicating with the two abdominal
cavities, arranged one above another in the band, Chang’s being the
lower of the two. No remains of an umbilical vein were detected, nor was
there any communication between the pouches and the umbilicus. It has
already been noticed that the round ligament of each liver passed from
the longitudinal fissure to a scar on the anterior wall of the abdomen
near the band. It was not, therefore, within the round ligaments, but
the folds of the suspensory ligaments, that the pouches were found.

Eng’s pouch measured 2-1/2 in. From edge of Chang’s suspensory ligament
to end of hepatic pouch measured 3 in.

Extending across the band, about midway between the properties of the
two individuals, was a septum. It was attached above and below to the
respective boundaries of the band, and along its entire length was
incorporated with its two peritoneal cavities, so that when in the
course of the dissection of the “posterior” surface of the band the
peritoneal covering of the band was displayed, several large lobules of
fat were seen lying to Eng’s side of the septum.[4]

-----

Footnote 4:

  Before the septum was known to exist, the band was opened from behind
  in the presence of the Fellows of the College (Feb. 18th, 1874). The
  exact relations of the septum could not at that time be determined.
  Figs. 8, 9, and 10 are taken from studies of the parts made the day
  after the meeting.

-----

It will be seen that Fig. 8 represents the band opened to display the
pouches with the septum. The lower end of the septum is fixed near the
scar of the umbilicus, and holds an immobile position over the umbilical
pouches. At this point it is free from fat. But as it extends over the
hepatic pouches it is more pliant. This portion of the septum has been
carried a little to Chang’s side of the band to display the entire
length of the hepatic pouch of Eng.

Figs. 9 and 10 are designed to exhibit the appearances presented in
securing views of the septum from its sides. Fig. 9 is the side toward
Chang, and Fig. 10 is the side toward Eng.

[Illustration Figure 8:

  Fig. 8.   The surface, C. R., E. L., showing the interior of band by
            free division of the aponeuroses seen in Fig. 7, and their
            underlying peritoneal attachments.

       A.   The orifice of umbilical pouch of Eng.

       B.   The orifice of umbilical pouch of Chang, showing connection
            with suspensory ligament of Eng.

       C.   The fenestrated umbilical pouch of Eng passing between the
            folds of the suspensory ligament of Chang.

       D.   Suspensory ligament of liver of Eng.

       E.   Hepatic tract.

       F.   Hepatic pouch of Eng.

       G.   The septum. ]


The pouches and septum were now removed and the position of the hepatic
tract determined. It rested upon the incurved borders of the ensiform
cartilages (see Fig. 15), and as the subject lay on the table with the
“posterior” surfaces of the band exposed (Fig. 11) the hepatic tract was
slightly arched. It measured three inches in length, was compressed, and
measured six lines wide and three lines thick. The tract arose from the
livers at the same point—namely, directly above the longitudinal
fissure, having more fulness on the side of the right than of the left
lobe. The round ligament, as it passed out of the longitudinal fissure
of each liver, was placed beneath and a little to the left of the tract.

[Illustration Figure 9:

  Fig. 9.   The septum viewed from Chang’s side.

       A.   The orifice of umbilical pouch of Chang.

       B.   The orifice of the hepatic pouch of Chang.

       C.   Suspensory ligament of Chang containing umbilical pouch of
            Eng. ]


[Illustration Figure 10:

 Fig. 10.   The septum viewed from Eng’s side.

       A.   The orifice of the umbilical pouch of Eng.

       B.   The orifice of the hepatic pouch of same.

       C.   Suspensory ligament of Eng containing the umbilical pouch of
            Chang. ]


3. _The vascular structures of the band_ were as follows:—

The livers being united, it was found that a colored injection thrown
into the portal vein of Chang passed into the liver of Eng. A careful
dissection of the blood vessel (Fig. 11, C) proved it to be a terminal
twig of the portal system of Chang. It was of the thickness of a No.
seven catheter, French scale, gradually diminished in size, and was
lost toward the centre of the band. It did not pass as such across the
band, but appeared to break up into minute branches before reaching
the liver of Eng. At the same time there was undoubted distension of
the portal capillaries with the colored fluid under the capsule of
the dorsal surface of the right lobe of Eng’s liver, one and one-half
inches from the band. Examination of the branches of the mesenteric
veins of Eng revealed the curious fact that some of them had received
the injection. This had not been transmitted through the liver, for the
portal vein at the transverse fissure was empty, but through a distinct
extra-hepatic portal track, which was found lying under the peritoneum
beneath the position of the hepatic pouches, and in association with
the umbilical pouches. This vessel began by relatively large radicals
towards Chang’s side, became larger as these encroached on Eng’s side,
and was finally received within the portal system of Eng’s body, as a
tributary to its mesenteric vein.

[Illustration Figure 11:

 Fig. 11.   The surface, C. R., E. L., with pouches removed to display
            the hepatic tract.

       A.   Liver of Chang.

       B.   Liver of Eng.

       C.   Portal vessel of Chang.

    D, D.   Minute branches of hepatic artery.

       E.   Subcutaneous fat of surface, E. R., C. L. ]


No other vessels were met with in the band excepting a few insignificant
branches of the hepatic artery, and the terminal twigs of the right
internal mammary of Eng. The former vessels are marked D, D, Fig. 11.
The latter vessel terminated by piercing the diaphragm, and giving
ultimate filaments to the integument of the “front” of the band as shown
in Fig. 12.

[Illustration Figure 12:

 Fig. 12.   The surface, C. R., E. L., with pouches, hepatic tract, and
            peritoneal attachments removed to display the diaphragms.

       A.   Subcutaneous fat of surface, E. R., C. L.

    B, C.   Symmetrical muscular fasciculi.

       D.   Fasciculi of Eng crossing the median line of the band. ]


4. _The diaphragms._—The subject being in the same position as in Fig.
2, the livers were removed, the peritoneal coverings dissected from the
band, and the diaphragms exposed (Fig. 12). The point (A), marked by the
terminal twigs of the right internal mammary of Eng, indicated the
“anterior” of the band. A broad slip of fibres of Chang (B) was seen to
pass across the median line, and to be inserted into the left border of
the ensiform cartilage of Eng (Fig. 17). This arrangement would appear
to correspond to the smaller collection of fibres (C) belonging entirely
to Eng. A second arrangement of fibres was seen above those just
indicated, immediately under the cartilages (D). This appeared to arise
from the border of the cordiform tendon of Eng by two distinct narrow
slips, which crossed the median line to be inserted dispersedly on the
diaphragm of Chang.

[Illustration Figure 13:

 Fig. 13.   The peritoneal linings of the anterior walls of both
            abdominal cavities.

    A, A.   The summits of the bladders.

    B, B.   The umbilical ligaments.

    C, C.   The nodules of fat at the parietal scar.

    D, D.   The isolated lobules of fat. ]


5. _The ensiform cartilages._—After removing the diaphragms the
cartilages were exposed. They may be described as follows:—

Chang.—The cartilage measured 2-1/2 in. wide, and 8 in. in length along
its axis. The right border was very prominent, and projected 1/2 in.
beyond the limit of the corresponding border in Eng. It was almost in
close contact with the cartilage of the eighth rib; it was very robust,
with upper surface convex, under surface nearly plane. The left lateral
border was 2-1/2 in. in length, right lateral border 11 lines in length.
The former was marked by three tubercles of about equal size. One
situated about 1 in. from the sternal origin; the other about 2 in. from
the same point; the third at its extreme anterior border. None of these
were robust, or presented any of the thickening noticed on the right
side. The middle of these tubercles was on a line with that of the
posterior tubercle. The junction of the ensiform process with the
sternum was not marked by the eminence characterizing the similar point
in Eng.

Eng.—The cartilage differed from that of Chang in being 2-1/3 in. wide,
11 lines in length of axis. The left lateral border was abruptly
deflected downward, and did not present the transverse smooth projection
noticed in Chang. This deflection was almost at right angles to the
dorsal surface, acuminate inferiorly, and presenting a straight surface
toward Chang, and an oblique one toward the ribs. The length of left
lateral border was 1 in. The right lateral border, 1-1/3 in. in length,
presented a smooth sub-rounded edge without tubercles, and terminated in
a free rounded border on a plane a little above that of Chang. On the
whole this border was more robust than that of Chang. On the dorsal
aspect of the process near its base was seen the rounded eminence
described in the account of the external appearances (see page 7).

A comparison between the two ensiform cartilages shows that in Chang the
anterior border was longer than in the right in Eng. In other
proportions Eng’s was equal if not larger than Chang’s, and was more
robust.

[Illustration Figure 14:

 Fig. 14.   A section of both ensiform cartilages, C. R., E. L.

       A.   Chang’s cartilage.

       B.   Eng’s cartilage.

       C.   The synchondrosis.

       D.   The bursa-like sac covering the same.

       E.   An opening in the sac.

       F.   Transversalis muscle of Eng.

       G.   Transversalis muscle of Chang. ]


The union between the cartilages was of the character of a symphysis.
The union was very intimate along the border E. L., C. R., “posterior”
(Fig. 14); the exposure of the junction by a delicate transverse cut
showed a close union between the cartilages, thus constituting this part
of the band a synchondrosis. That this, however, did not characterize
the entire line of apposition was at once seen by turning to the border
E. R., C. L. (“anterior”), where an interval, two lines in width, was
seen between the cartilages, an interval which had been evidently
susceptible of variation during life. This interval extended across
one-fourth the width of the band. The portion of the band between the
parts as above indicated, was occupied by a bursa-like sac (Fig. 14, D),
which was opened by a minute orifice (E) to display its true nature.
This sac was crossed above by a stout band of fibrous tissue (Fig. 15,
A) an inch in width. Beneath, the sac was protected by a less
well-defined band of the same width as the upper ligament, and which
crossed between the two processes, to be lost in the perichondrium.

[Illustration Figure 15:

 Fig. 15.   Upper surface of ensiform cartilages.

       A.   The upper ligament uniting the cartilages. ]


Viewing the cartilages as the constituent parts of the band, we found
the border C. L., E. R., the “anterior,” to be longer than C. R., E. L.,
the “posterior.” C. L., E. R. was a convex, nearly even border, C. L.
being larger than E. R., with a gaping interval placed nearer Eng than
Chang. C. R., E. L. was an irregular, uneven border, without interval,
C. R. being smaller than E. L., and placed to the outer side.


                         VI. Other Structures.

1. _The spleens._—This organ in Eng was 5 in. long, 3-1/3 in. wide. The
dorsum was marked by a large sulcus, extending nearly across the organ,
continuous with the sulcus on the superior border. The hilus was
relatively shorter than that of Chang, beginning above, fully an inch
below its upper border, and terminating within a half inch of its
inferior border.

In Chang it measured 5 in. long, 2-1/3 in. wide. It was sub-elliptical
in form, upper lip somewhat abruptly compressed. The lower border was
obtuse and rounded. The dorsum was smooth, and presented at its
posterior edge a single sulcus placed midway between the tip and the
inferior border. The hilus extended nearly the entire length of the
under surface.

2. _The livers_ (Fig. 16).—In Eng the liver was 9 in. broad. The right
lobe was 7-1/2 in. wide, antero-posteriorly. The fundus of the
gall-bladder was seen on the anterior edge of the organ. The only
noticeable feature on the under surface of the liver, was the lobus
Spigelii. This was large, measuring 2 in. in transverse diameter, and
2-1/3 in. in antero-posterior diameter. It presented a somewhat
increased breadth of neck, which was overlapped by an anterior
prolongation of the lobe, and terminated by a rounded compressed
extremity at the transverse fissure. The quadrilateral lobe was well
developed, 2 in. long in greatest diameter, 10 lines wide.

[Illustration Figure 16:

 Fig. 16.   The livers.

       A.   Right lobe of Eng.

       B.   Left lobe of same.

       C.   Right lobe of Chang.

       D.   Left lobe of same.

       E.   Hepatic tract.

       F.   Round ligament of Eng.

       G.   Round ligament of Chang.

       H.   Accessory suspensory ligament of Eng, with termination of
            the right mammary artery.

       I.   Fundus of gall-bladder of Chang.

       J.   Fundus of gall-bladder of Eng. ]


In Chang the liver was 8-1/3 in. broad. The right lobe was 5 in. wide,
antero-posteriorly. The appearance of the gall-bladder corresponded to
that seen in Eng. The under surface was normal. The lobus Spigelii
presented a narrower neck than in Eng, the anterior prolongation being
greater. The quadrilateral lobe was less developed than in Eng. Indeed
it was not raised above the under surface of the right lobe, and its
limits were so imperfectly marked that it could not well be measured.

[Illustration Figure 17:

 Fig. 17.   Kidneys of Eng.

       A.   Left kidney.

       B.   Right kidney.

       C.   Left renal vein.

       D.   Left supra-renal vein.

       E.   Left spermatic vein.

       F.   Descending vena cava not distended with clot.

       G.   Right renal vein.

       H.   Aorta distended with plaster.

       I.   Primitive iliac arteries. ]


3. _The kidneys._—In Eng, the body lying on the table E. R., C. L., the
left kidney (Fig. 17, A) was 4 in. long, 1-1/2 wide at its hilus, and of
the usual kidney shape. It lacked 1/2 in. of reaching the crest of the
ilium. The renal vein (Fig. 17, C) of the same side measured 3 in. in
length, and was decidedly oblique in position, its termination in the
cava being below the level of the lower end of the kidney.

The right kidney (Fig. 17, B) corresponded in position to the left
kidney of Chang, that is to say, it was in the shallower portion of the
abdomen, and in contact with the abdominal wall. It measured 4 in. in
length, and 2-1/4 in. in width. Its inferior border lacked 2 in. of
reaching the superior crest of the ilium. The renal vein ascended a
little upward to enter the cava a little below the level of the upper
end of the kidney.

In Chang, the body lying in such a way that the great trochanter of the
right side rested on the table, the left trochanter being raised three
inches from the same plane, an obliquity was given to the trunk, and
rendered the position of the abdominal organs somewhat anomalous.

The left kidney (Fig. 18, A) lay with its lower half clearly within the
iliac fossa, its inferior border answering to a point an inch and a half
below the termination of the aorta. The organ lay, at its inner and
inferior portion, upon the left primitive iliac vein; it measured 3-3/4
in. in length, and 2-7/12 in. in width at its widest part. It was larger
below, where it retained the usual appearance, but was somewhat abruptly
pointed above, and was marked by the characteristic notch on its inner
side. The renal vein (Fig. 18, C) was very obliquely situated, indeed
was almost parallel with the cava, and was 3-1/2 in. long. The
termination of the renal vein answered to a line running across the
abdomen lying fully 1 in. above the upper end of the left kidney.

[Illustration Figure 18:

 Fig. 18.   Kidneys of Chang.

       A.   Left kidney.

       B.   Right kidney.

       C.   Left renal vein.

       D.   Right renal vein.

       E.   Left spermatic vein.

       F.   Aorta filled with plaster.

       G.   Primitive iliac veins.

       H.   Descending cava distended with clot.

       I.   Left supra-renal vein. ]


The right kidney (Fig. 18, B) was normally situated. It measured 4 in.
in length, and 1-1/2 in. in width at its centre, and presented the usual
reniform appearance. Its inferior edge just reached an eminence
answering to the superior crest of the ilium.

4. _The testicles._—The right testicle of Eng was normal. The left
testicle was not within the scrotum. Dissection from within the abdomen
showed that the organ had been retracted. It lay well concealed within
the inguinal canal, slight traction making it appear within the abdomen.

The testicles of Chang were normal.

5. _The hearts._—The heart in Eng was situated nearer the median line
than normal. The abdominal incision was very unfavorable for studying
its exact position in the mediastinum. It was removed through an opening
made in the diaphragm. The right side of the heart was occupied by a
soft grumous clot much smaller than was found in the same locality in
Chang, and which did not distend the cavities. The left side was normal.
It was without clot so far as could be determined in the injected
condition of the ventricle.

The heart of Chang presented a right auricle and ventricle distended
with a dense venous clot; this extended from the right ventricle along
the pulmonary arteries. The left side of the heart was empty.

The ductus arteriosus and foramen ovale were firmly closed in both
hearts.

6. _The vessels._—The arteries of both subjects were, so far as
examined, in an extremely atheromatous condition. Large plates of
calcareous matter were deposited in the abdominal aortas. The injecting
matter flowed insufficiently in the left lower extremity of Chang, from
a clot plugging the femoral artery.

The venous system of Chang was engorged, giving the appearance of these
vessels having been injected after death; that of Eng was comparatively
empty.

7. _The lungs._—The lungs were so altered by _post-mortem_ changes prior
to embalming, their contraction by the chloride of zinc, and their
increase of weight from the plaster, that no extended examination was
made of them. But little difference was seen between the conditions of
the lungs in the two men. No hepatization was present in Chang.

8. _The vertebral column and ribs._—There was marked lateral curvature
of the vertebral column in both bodies. This was more conspicuous in
Chang. The convexity of the curve was about half-way down the vertebral
column, and inclined in Chang to the right side. The distance from the
centre of the vertebral column to the left abdominal wall, 2 in.; to the
right abdominal wall, 5 in. The left side of the abdominal cavity,
measuring from about the level of the band to the last rib of the right
side, 7-1/2 inches.

The ribs in both Chang and Eng were 22 in number, 7 true and 4 false. On
the right side of Eng the first, second, and third ribs were normal. The
fourth, fifth, sixth, and seventh presented diminished intercostal
spaces, owing probably to the extreme traction made on them by the
deflection of the ensiform cartilages. The intercostal space between the
third and fourth ribs was slightly contracted; that between the fourth
and fifth ribs was very much contracted, the muscle being bulged inward.
Between the fifth and sixth, and sixth and seventh ribs the space was
less contracted. The remaining intercostal spaces were about normal. The
fifth rib near its articulation with the vertebral column formed a
well-defined ridge within the thorax, carrying with it the sixth and
seventh ribs, thus forming a rounded elevation, distinguishing the
positions of these ribs from the thoracic wall above and below this
point, where the parietal surface presented the usual concave
appearance.

On the left side of Chang a similar arrangement of ribs and intercostal
spaces was seen to the above.

The remaining organs were not examined.




                                REMARKS.


With reference to the cause of death of the Siamese twins it may be
briefly said that, in consequence of the restrictions by which we were
bound, no examination of the brains was made. It cannot, therefore, be
proved that the cause of Chang’s death was a cerebral clot, although
such an opinion, from the suddenness of death, preceded as it was by
hemiplegia and an immediate engorgement of the left lung, is tenable.
Eng died, in all probability, in a state of syncope induced by fright—a
view which the over-distended bladder and the retraction of the right
testicle would appear to corroborate.

The existence of lateral curvature was not unsuspected. It was known to
those who had examined the twins before death. Indeed, it must have been
a necessity of the acquired position.

The presence of a pad of subperitoneal fat at the usual position of the
umbilicus was certainly curious. It would appear to be an example of a
localized nutritive change about the peritoneum, at the centre of the
umbilical region, anticipating the exit of the vessels of the cord at
that point. Familiar examples of this anticipation between structures
developing from different layers of the embryo are seen in malformations
of the genital organs, eye, ear, etc. In the above example it is
remarkable only from the rarity of the conditions yielding it.

The circulation in each individual of the twins was practically
complete, since the demonstration of continuity between the portal
systems, although satisfactory, invites the conclusion that the amount
of blood which passed from one to the other side of the band must have
been, in the condition of the parts at the time of the demonstration,
very inconsiderable, and was not competent in all probability to modify
the performance of any act of the economy.

In the fœtal and early period of extra-uterine life the vessels must
have been more capacious, and associated with a large tract of liver
tissue. It follows, all things being equal, that an attempt at division
of the band in early life would have been accompanied with more venous
hemorrhage than at any subsequent period.

In proof that the twins were the product of a single conception, the
strict correspondence between the markings of the two spleens, as well
as the number of the ribs, may be observed. The absence of available
data bearing upon the question of symmetry between visceral organs of
twins, prevents us from drawing here too positive an inference. It is
probable, however, that the twins were individuals of a single organism,
remarkable for its complete expression of duplex bilaterality.[5]

-----

Footnote 5:

  I desire to return thanks to Dr. T. H. Andrews and Dr. J. W. White,
  Jr., for important assistance rendered in preparing the notes of the
  autopsy.

-----

[Illustration Figure 19:

 Fig. 19.   Foreshortened view of the trunks, showing in the acquired
            position the band from above and the contours of its
            lateral surfaces. ]




                        DESCRIPTION OF FIGURES.

                           FROM PHOTOGRAPHS.

  Fig. 1. Twins in acquired position (E. R., C. L.). Taken in St.
          Petersburg, 1870.  Page 3.

  Fig. 2. Twins in acquired position (E. R., C. L.). Taken after death
          at Philadelphia.  Page 8.


                             FROM SKETCHES.

  Fig. 3. The surface, C. R., E. L., exposed by removal of skin and
          superficial fascia to display the tendons of the external
          oblique muscles and adjacent parts.  Page 12.

       A. The superficial fascia—lost over the position of Chang’s
          umbilical pouch.

    B, C. Supplemental layers of fibrous tissue of Eng not seen in
          Chang; B is a continuation toward Eng of aponeurotic fibres
          having a source from the linea alba of Chang;
          C is independent of the former, and is continuous with the
          deep pectoral fascia.

       D. The interlacing of fibres on tendon of external oblique muscle
          of Chang.

       E. The linea alba of Chang, beginning at C. R.

       F. Its continuation to E. L., and insertion upon the ensiform
          cartilage.


  Fig. 4. The umbilical ligament in Eng.  Page 15.

       A. The umbilical ligament.

       B. The lobule of fat at position of normal umbilicus.


  Fig. 5. The umbilical ligament in Chang.  Page 16.
              The letters as in Fig. 4.


  Fig. 6. The abdominal organs of Eng—the small intestines removed.
          Page 17.

       A. Left lobe of liver.

       B. Right lobe of liver.

       C. Gall-bladder.

       D. Suspensory ligament.

       E. Lobules of fat in the position of the termination of the
          umbilical ligament.


  Fig. 7. The abdominal organs in Chang—the small intestines removed.
          Page 19.     The letters as in Fig. 6.


  Fig. 8. The surface, C. R., E. L., showing the interior of band by
          free division of the aponeuroses seen in Fig. 7, and their
          underlying peritoneal attachments.  Page 24.

       A. The orifice of umbilical pouch of Eng.

       B. The orifice of umbilical pouch of Chang, showing connection
          with suspensory ligament of Eng.

       C. The fenestrated umbilical pouch of Eng passing between the
          folds of the suspensory ligament of Chang.

       D. Suspensory ligament of liver of Eng.

       E. Hepatic tract.

       F. Hepatic pouch of Eng.

       G. The septum.


  Fig. 9. The septum viewed from Chang’s side.  Page 25.

       A. The orifice of umbilical pouch of Chang.

       B. The orifice of hepatic pouch of Chang.

       C. Suspensory ligament of Chang, containing umbilical pouch of
          Eng.


 Fig. 10. The septum viewed from Eng’s side.  Page 26.

       A. The orifice of umbilical pouch of Eng.

       B. The orifice of hepatic pouch of Eng.

       C. Suspensory ligament of Eng, containing umbilical pouch of
          Chang.


 Fig. 11. The surface, C. R., E. L., with pouches removed to display the
          hepatic tract.  Page 27.

       A. Liver of Chang.

       B. Liver of Eng.

       C. Portal vessel of Chang.

    D, D. Minute branches of hepatic artery.

       E. Subcutaneous fat of surface, E. R., C. L.


 Fig. 12. The surface, C. R., E. L., with pouches, hepatic tract, and
          peritoneal attachments removed to display the diaphragms.
          Page 28.

       A. Subcutaneous fat of surface, E. R., C. L.

    B, C. Symmetrical muscular fasciculi.

       D. Fasciculi of Eng, crossing median line of band.


 Fig. 13. The peritoneal linings of the anterior walls of both abdominal
          cavities.  Page 29.

    A, A. The summits of the bladders.

    B, B. The umbilical ligaments.

    C, C. The nodules of fat at the parietal scar.

    D, D. The isolated lobules of fat.


 Fig. 14. A section of both ensiform cartilages, C. R., E. L.  Page 31.

       A. Chang’s cartilage.

       B. Eng’s cartilage.

       C. The synchondrosis.

       D. The bursa-like sac covering the same.

       E. An opening into the sac.

       F. Transversalis muscle of Eng.

       G. Transversalis muscle of Chang.


 Fig. 15. Upper surface of ensiform cartilages.  Page 32.

       A. The upper ligament uniting the cartilages.


 Fig. 16. The livers.  Page 34.

       A. Right lobe of Eng.

       B. Left lobe of same.

       C. Right lobe of Chang.

       D. Left lobe of same.

       E. Hepatic tract.

       F. Round ligament of Eng.

       G. Round ligament of Chang.

       H. Accessory suspensory ligament of Eng, with termination of the
          right mammary artery.

       I. Fundus of gall-bladder of Chang.

       J. Fundus of gall-bladder of Eng.


 Fig. 17. Kidneys of Eng.  Page 35.

       A. Left kidney.

       B. Right kidney.

       C. Left renal vein.

       D. Left supra-renal vein.

       E. Left spermatic vein.

       F. Descending vena cava not distended with clot.

       G. Right renal vein.

       H. Aorta distended with plaster.

       I. Primitive iliac arteries.


 Fig. 18. Kidneys of Chang.  Page 37.

       A. Left kidney.

       B. Right kidney.

       C. Left renal vein.

       D. Right renal vein.

       E. Left spermatic vein.

       F. Aorta filled with plaster.

       G. Primitive iliac veins.

       H. Descending cava distended with clot.

       I. Left supra-renal vein.


 Fig. 19. Foreshortened view of the trunks, showing in the acquired
          position the band from above, and the contours of its lateral
          surfaces.  Page 42.




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                          Transcriber’s notes:

    ● The errors deemed most likely to be the printer’s have been
      corrected, and are noted here.
    ● Where hyphenation occurs on a line break, the decision to retain
      or remove is based on occurrences elsewhere in the text.
    ● Errors in punctuation and quotes have been silently restored.
    ● Illustrations have been moved to the corresponding paragraph.
    ● The footnotes were moved to near the corresponding paragraph.
    ● The numbers below reference the page and line in the original
      book.


  reference  correction      original text
    86.36    abruptly        but was somewhat abruptedly pointed
     26.4    blood vessel    A careful dissection of the bloodvessel

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