XIX.] STRUCTURE OF LIVER. GLYCOGEN. 207 



3. Prepare sections of liver, the blood-vessels of 

 which have been injected with Berlin blue or 

 with carmine-gelatine. Clear and mount in 

 Canada balsam. Observe comparing with the 

 uninjected specimens. 



a. The hepatic veinlet, seen according to the 

 plane in which the lobule is cut, either as a 

 more or less circular section, or as a short 

 veinlet passing from the centre of the lobule 

 to the sub-lobular vein. 



h. The portal veinlet running on the outside of 

 the lobule. 



c. The radial capillary network between the 

 portal and hepatic veinlets united by nu- 

 merous cross branches, commonly there is 

 only one row of ceUs between the radial 

 capillaries. 



4 Mount in Canada balsam a section of mammalian 

 liver which has been injected from the bile duct. 

 The bile capillaries will be seen within the lobules 

 as a fine network of minute threads of injected 

 material, passing between and over the surfaces 

 of the cells. 



5. Scrape a small portion of perfectly fresh liver, 

 and observe the pale, granular, hepatic cells, 

 often containing fat globules (cp. § 2, h, a.) 



