262 



Kojima 



Fig. 4. — Section fioni a normal rat-pancreas like that shown in fig. 1, but 

 stained by Mallory's method (acid fuclisin, orange G, and aniline blue) 

 instead of hsematoxylin. Microphotograph ; magnified 100 diameters. 

 The zymogen masses, which are stained deep red by the acid fuchsin, 

 come out black in the photograph. Au islet of Langerhans is included 

 in the field : zymogen is most abundant in the circumjacent alveoli. 



. 5. — Section of the same pancreas, also stained by Mallory's method 

 but magnified 500 diameters. 



The zymogen granules come out black in the photogra})h. Some of 

 the nuclei of the cells are faintly shown. 



