EXPLANATION OF PLATES. 



The photographs are ail taken with a magnification of 600 diameters. 



PLATE I. 



First set of experiments on winter newts. 



1. Fundus of an oxyntic gland, lower end of stomach after prolonged fasting. 



2. Transverse section of fundus of oxyntic gland, lower end of stomach twenty 

 hours after food. The cells are almost exhausted. 



3. Transverse sections of the fundus of several oxj'ntic glands, lower end of 

 stomach, 44 hours after food. The granules hâve remade their appearance in con- 

 sidérable numbers. 



4. A similar section from another part of the stomach. 



5. Transverse section of the fundus of an oxyntic gland, lower end of stomach 

 68 hours after food. The nuclei show a considérable amount of repair. 



6. Oxyntic gland, lower end of stomach, 114 hours after food. The cells hâve 

 almost completely regained their resting condition and two nuclei show early stages 

 of mitosis. 



Second set of experiments on summer newts. 



7. Oxyntic gland, upper end of stomach 1/2 hour after food. Sécrétion has 

 already commenced. 



8. Oxyntic gland, upper end of stomach i hour after food. Sécrétion slightly 

 more advanced. 



9. Oxj-ntic gland, upper end of stomach, i 1/2 hours after food. The nuclei 

 are beginning to wrinkle. 



10. Oxyntic gland near œsophagus, 2 1/2 hours after food, showing the large 

 size of the zymogen granules in this région. 



11. Ox3'ntic gland, upper end of stomach 3 hours after food, showing consi- 

 dérable exhaustion. 



12. Oxyntrc gland upper end of stomach 4 hours after food, chromatin of 

 nucleus almost disappeared. 



PLATE IL 



13. A similar section from the lower end of the stomach showing great ex- 

 haustion. 



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