422 Cytology of the Areas of Langerhans 
EXPLANATION OF FIGURES ON PLATE I. 
Fig. 1. Section of an Islet of Langerhans of the Guinea pig, fixed in 70 
per cent alcohol, stained with Bensley’s Neutral Gentian, showing the A cells 
of the islet filled with intensely stained granules, {3 cells orange. Zeiss apo. 
2) mime, OG: 8: 
Fic. 2. Islet of Langerhans of the Guinea pig; aqueous chrome-sublimate 
fixation; neutral gentian stain; showing £ cells filled with minute violet gran- 
ules; A cells orange, the staining reaction being reversed. Pancreatic acini, 
Pa. z. with zymogen granules are seen at the edges of the section. 
