The röle of the chondriosomes in the cells of the guinea-pig’s pancreas. 271 
Fig. 10. Alveolar cell. Fixation Benda. Stain, Heidenhain’s iron-alum haema- 
toxylin, thionin and orange G. 
Beginning of the secretory phase, a little earlier than cell in Fig. 4. At “a” a chon- 
driokont is seen dividing into four large sections, the anterior ones of which will again 
snbdivide to form granules. 
Fig. 11. Cell from islet of Langerhans. Fixation Benda. Stain, Heiden- 
hain’s iron-alum haematoyxlin, thionin and orange G. 
The cytoplasm is full of small mitochondria; the margin of the cell is ill defined. 
Fig. 12. Alveolar cell. Fixation Benda. Stain, Heidenhain’s iron-alum haema- 
toxylin, thionin and orange G. 
At the middle of the secretory phase. The cliondriokonts in this cell are rather 
longer than usual. At “o” a chondriokont similar to Fig. 10 a. 
Fig. 13. Portion of an alveolus. Fixation Benda. Stain, Heidenhain’s iron- 
alum haematoxylin, thionin and orange G. 
From the inner portion of the section, where owing to the feeble penetrating 
power of the osmic acid, the fixation of the chondriokonts is imperfect. The small 
granules are well preserved. Only two cells in this cross section of the alveolus con- 
tain them. 
nu = nucleolus. m = mitochondria. 
