EXPLANATION OF THE PLATES. 



PLATE LV. 



Fig. 1. A portion of the surface of the liver showing the 

 lobules and the intra-lobular hepatic veins. The 

 injection has filled only the larger vessels, and has 

 scarcely penetrated to the capillaries. 



Fig. 2. Section of liver in which the hepatic venous system 

 has been very completely injected, and the portal 

 (in yellow) only slightly so. The communication 

 between the vessels of different lobules is also well 

 shown. Drawing made from a preparation of 

 Dr. Hanfield Jones. 



Fig. 3. Would appear to be a portion of the portal system ; 

 the injection was thrown in from the ductus com- 

 munis choledochus. When introduced in this way, 

 this system always becomes irregularly filled ; and 

 the lobules are not circumscribed as when the in- 

 jection enters directly by the portal vein. 



Fig. 4, A section of liver in which the interlobular portal 

 vessels are shown. The injection in this case also 

 fills only the principal vessels, and has not ex- 

 tended to the capillaries. 



