270 A Study of the Structural Unit of the Liver 
point, according to Kiernan, the intralobular veins change into sublobu- 
lar. This distinction is rather arbitrary and of little value, but has clung 
as a parasite to the text-books. In general hepatic veins with capillaries 
arising from them are called central or intralobular veins and larger veins 
are called sublobular; sublobular veins are hepatic veins from one to two 
millimeters in diameter. 
Fig. 33. Photograph of a celloidin corrosion of the liver lobule and the 
portal unit. X 2. The dark clumps are the portal and the light anastomosing 
bodies are the lobules. 
Fie. 34. HIGs oD: 
Fic. 34. Plastic diagram of a group of anastomosing lobules with the 
terminal branches of the portal vein, marking the centers of the portal units, 
added. Enlarged about 10 diameters. 
Fic. 35. Diagrammatic outline of the group of lobules, shown in Fig. 34, 
with the hepatic vein added. 
I have studied carefully the hepatic lobule in the dog’s liver and found 
that in general I can confirm practically everything that Kiernan has 
said of it. Numerous injections have been made of the hepatic vein, 
either singly or in combination with injections of other vessels. Figure 
