XIX.] STRUCTURE OF LIVER. GLYCOGEN. 205 



c. The cell granules. According to the con- 

 .dition of the animal from which the liver 

 was taken, these are seen to stretch through- 

 out the cell or to be groiiped around the 

 lumen (bile capillary). 



d. The fat globules, stained black with osmic 

 acid, they vary greatly both in number and 

 position according to state of the animal from 

 which the liver was taken. 



e. The glycogen content of the cells. Mount 

 a section in water and run a little strong 

 iodine underneath the cover-slip, the parts of 

 the cell containing glycogen will stain a deep 

 brown-red (cp. B, § 2, a). 



Prepare sections of a mammalian liver, prefer- 

 ably that of a pig, hardened in Miiller's fluid 

 or potassium bichromate 2 p. c. The sections 

 should be made parallel to the surface of the 

 liver. Stain with haematoxylin and mount in 

 glycerine. 



a. Observe with a low power 



a. The division into lobules. 



/3. In the centre of most of the lobules the 

 very thin-walled hepatic or intralobu- 

 lar veinlet; those in which it is not 

 seen have been cut through nfear the 

 outer end of the lobule. 



