Franklin P. Mall 305 
But it is difficult to imterpret these specimens, for it is not easy to deter- 
mine which vessel is a portal vein, unless reconstructions are made, which 
is often out of the question. In the earliest stage, Fig. 61, the capil- 
laries encircle both hepatic and portal veins, the vessel to the left being 
an hepatic vein. The same is probably true in an older embryo, Fig. 62, 
while in a feetus at birth the bile duct pictured lies at the junction of 
two portal veins. When the terminal ducts are arranged in order, as 
shown in Figs. 64-67, it is seen that the first bile ducts are formed around 
the portal veins from bile capillaries. Longitudinal sections, Figs. 68-72, 
indicate the same. ‘This interpretation of the specimens, which was 
Fic. 66. Fig. 67. 
Fics. 64, 65, 66 and 67. Golgi specimens of the livers of fcetal pigs, 5, 6, 7 
and 8 cm. long. X53. The portal twigs are shown in transverse section. 
After Hendrickson. 
first given by Hendrickson™ is rational, and subsequent observations, 
which I have been able to make from some of Mr. Eben Haill’s 
skillful injections of the bile ducts in the embryo, corroborate Hendrick- 
son’s view. The untimely death of Dr. Hendrickson made his prelimi- 
nary report his final publication upon this subject, and it is now a pleas- 
ure to me to carry out in part one of his desires. The obstacle at the 
time of his publication was a lack of knowledge of the vascular tree and 
complete pictures of the bile ducts, especially in young embryos. Mr. Hill 
has supplied the latter by filling the bile ducts of a pig’s embryo 10 cm. 
long. In the early stages diluted Higgin’s India ink was injected di- 
* Hendrickson, Johns Hopkins Hospital Bulletin, 1898. 
