FOOD AND DIGESTION 



of the alcohol the gland is pulverized and extracted in strong glycerin. 

 The amount of the ferment greatly increases if the gland be exposed to the 

 air for three or four hours before placing in alcohol; indeed, a glycerin 

 extract made from the gland immediately upon the removal from the body 

 often appears to contain none of the ferments. The conversion of zymogen 

 in the gland into the ferment takes place only after the gland stands a while. 



1. 



z. 



3. 



s. 



6. 



7. 



. 



Jit 





\ 



32 



U 



16 



JtCOk. 



- (Stead 



FIG. 268. Three Curves Showing the Secretion of Pancreatic Juice upon a Diet (i) 

 of 600 cc. of milk; (2) of 250 gm. of bread; (3) of 100 gm. of meat. The divisions along 

 the abscissae represent hours after the beginning of the meal; the figures along the ordinates 

 represent the quantity of the secretion in cubic centimeters. (Walter.) 



Dilute acid assists or accelerates the conversion, and if a recent pancreas be 

 rubbed up with dilute acid before dehydration, a glycerin extract made 

 afterward, even though the gland may have been only recently removed from 

 the body, is very active. 



Nervous Regulation of the Secretion of the Pancreas. Fibers from 

 the vagus and from the splanchnics are distributed to the pancreas. In 

 Pawlow's laboratory it has been found that stimulation of these nerves leads 

 to the increased secretion of the pancreas. Popielski, in studying the effects 



