THEC PANREATIC JUICE 



359 



The secretion of the pancreas has been obtained for purposes of experi- 

 ment from the lower animals and from man in at least one case. A 

 pancreatic fistula is established in the dog by opening the abdomen and 

 exposing the duct of the gland which is then made to communicate with 

 the exterior. In Pawlow's method a circular bit of the intestinal mucous 

 membrane around the mouth of the duct in the intestine is brought to 



FIG. 267. Duct with Laterals to the Alveoli. Silver method of Golgi (E. Muller). A 

 Duct with branches; m, between the cells. B, Laterals more strongly magnified. 



the surface and stitched into the wound. The secretion is then easily col- 

 lected into a vessel suspended under the opening. 



The Pancreatic Juice. Pancreatic juice is colorless, transparent, 

 slightly viscid, and alkaline in reaction. It varies in specific gravity from 

 i .010 to i .030, according as it is obtained from a permanent fistula then 

 more watery, or from a newly opened duct. The solids vary in a temporary 

 fistula from 80 to 100 parts per thousand, and in a permanent one from 16 to 

 50 per thousand. It is characterized by having three distinct and important 



