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THE DIGESTIVE ORGANS. 



size. In the dog, from the sixth to the ninth hour of digestion, the 

 chief cells diminish in size and contain fewer zymogen granules, 

 while the parietal cells remain large and even increase in size. , 

 From the fifteenth hour on, the process becomes reversed; the 



Chief cell. " 



Lumen. 



Parietal cell. 



Mucosa. 



Fig. 213. Section through fundus of human stomach in a condition of hunger; X 5' 



Lumen. 



Chief cell. 



Fig. 214. Section through fundus of human stomach during digestion ; X 5- 



chief cells enlarge and the parietal cells diminish in size. In a con- 

 dition of hunger the cells of the pylorus are clear, of medium size, 

 and do not begin to enlarge until six hours after feeding. From 

 the fifteenth hour on, the cells become smaller and more turbid, 



