296 



Fig. is.— Section of pancreas of rat (male) fed with an addition of Ol grm. of sodium 

 iodide per diem to its ordinary diet during two periods of seven days, but with a 

 week's intermission. Microphotograph ; magnified 450 diameters. Mallory's stain. 



Fig. 19. — Section of pancreas of rat (male), the thyroid of which had been removed, fed 

 with an addition to its ordinary diet of 0-.3 grm. of sodium iodide per diem during 

 five days. Microphotograph ; magnified 90 diameters. Mallory's stain. 



If this section is compared with the normal (fig. 4), it will be seen that there is little 

 or no difference in the amount of zymogen in the alveoli. A section of an islet is seen 

 in the preparation, and it is observable that as usual there is more zymogen in the 

 alveoli adjacent to this than in the rest of the section. 



