228 PRACTICAL HISTOLOGY. 



accompanying the portal vein and those accompanying 

 the hepatic veins (Ludwig and Fleischl). Very fre- 

 quently, however, the injecting fluid finds its way into 

 the blood-system instead of the lymphatics. The injec- 

 tion of the lymphatics may be accomplished in another 

 manner, viz., by seeking those lymphatics which accom- 

 pany the hepatic veins at the back of the liver, and tying 

 a canula into them. After a time the fluid will be found 

 to pass out by the vessels which accompany the portal 

 vein. 



The investigation of the lymphatics of the liver is, 

 however, very difficult, and our knowledge of their course 

 and arrangement is still by no means satisfactory. 



Preparation 5. Hepatic cells. In addition 

 to what may be learnt from sections of the organ, 

 teased-out preparations afford much useful infor- 

 mation, both of the characters of the liver cells and 

 of the connective tissue of the lobules. For this 

 purpose small portions of the perfectly fresh and 

 warm liver are broken up in serum or salt solution, 

 and other portions are macerated for a day or two 

 in weak bichromate of potash, and subsequently 

 teased out in water. 



The pancreas is prepared in the same manner as 

 tbe salivary glands, to the description of which the 

 student is referred. 



