PLATE 1 



EXPLAXATION OF FIGURES 



1 A part of the typical islet, b, 6-type of cell; d, d-type; e, e-type; A, acinus 

 cell; be, blood-capillary. Fixation: sublimate-osmic-chromic acid (saturated 

 solution of sublimate, 4 parts; 2 per cent osmic acid, 2 parts; 1 per cent chromic 

 acid, 4 parts); staining: iron-hematolxyin. XllOO. 



2 Cross-section of an acinus containing a solitary islet cell, b. be, blood- 

 capillary; A, acinus cell. The same fixing as figure 1, and staining according to 

 Altmann's acid fuchsin method. XllOO. 



3 A non-typical islet consisting of a few numbers of islet cells; the latter 

 belonging to three adjoining acini, b, 6-type; e, e-type; C, centroacinus cell; 

 A, acinus cell; A', acinus cell showing the nucleolar hyperchromasy of the nucleus 

 and the cytoplasm, and preparing for transformation into the islet cell. The 

 same fixing and staining as figure 1. XllOO. 



46 



