182 PRACTICAL HISTOLOGY [XXIII 



The bile capillaries ; these are the lumina of the 

 tubes ; in longitudinal sections of the tubes the bile 

 capillaries are seen to take a zigzag course between the 

 inner ends of the cells. 



The cell granules arranged, according to the con- 

 dition of the liver, either throughout the cells or around 

 the lumen. 



The fat globules, stained black with osmic acid; 

 they vary greatly both in number and position according 

 to the condition of the liver. 



The glycogen content of the cells, indicated roughly 

 by the extent of the non-granular outer zone. Mount 

 a section in a solution of iodine; the parts of the 

 cell containing glycogen will stain a deep brown-red. 



2. Section of mammalian liver, preferably that 

 of a pig, made parallel to the surface of the liver. 

 (Miiller's fluid or potassium bichromate 2 p.c. ; hsema- 

 toxylin.) 



a. Observe with a low power 



The division into lobules ; in the pig, the lobules 

 are completely separated from one another by con- 

 nective tissue ; in the rabbit and in many other 

 mammals, the cell-columns of one lobule are continuous 

 in places with those of the neighbouring lobules. 



In the centre of most of the lobules the very thin- 

 walled hepatic or intralobular veinlet; those in 

 which it is not seen have been cut through near the 

 outer end of the lobule. 



Between the lobules the thin-walled portal or 

 interlobular veinlets, some of them of considerable 



