PHYSIOLOGY OF THE DIGESTIVE GLANDS 



475 



days after the operation, although, of course, under such circumstances no 

 appetite juice could have been secreted. Moreover, he observed that cats 

 when forcibly fed with unpalatable food may digest that food as rapidly 

 as when they eat voluntarily. In support of his contention, Carlson 

 states that he has frequently removed, all of the appetite juice from his 

 patient's stomach before the masticated meal was put into it without 

 any evident interference with the digestive process. 



Fat has a distinct inhibiting influence on the direct secretion of gas- 

 tric juice; cream takes considerably longer to be be digested than milk, 



14 < * ~ .9 1 ?* 1 4 S 6 7 S fi 101 23456 



Flesh, 200 gin. Bread, 200 gm. Milk, 600 c.c. 



Fig. 150. Cubic centimeters of gastric juice secreted after diets of meat, bread, and milk. (From 



Pavlov.) 



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Flesh, 200 gm. 



Bread, 200 gm. 



Milk, 600 c.c. 



Fig. 151. Digestive power of the juice,' as measured by the length of the protein column digested 

 in Mett's tubes, with diets of flesh, bread, and milk. (From Pavlov.) 



and the presence of oil in the stomach delays the secretion of juice poured 

 out on a subsequent meal of otherwise readily digestible food. By col- 

 lecting all of the gastric juice from the miniature stomach after feeding 

 by mouth with quantities of different protein-rich foods containing the 

 same quantities of nitrogen, interesting observations have been recorded 

 concerning the amount of juice secreted and its proteolytic power. The 

 results of some of the experiments are shown in the accompanying 

 curves (Figs. 150 and 151). 



