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 mm., oc. 8. 



FIG. 2. Islet of Langerhans of the Guinea pig; aqueous chrome-sublimate 

 fixation; neutral gentian stain; showing (3 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. 



