SALIVARY AND GASTRIC FISTULA. 



233 



Demonstration 10. The 



during the following conditions: 



1 . When various foods are 

 fed to the animal. 



2. When acid solution or 

 dry bread crumbs are thrown 

 into the mouth. 



3. When the animal is 

 teased with a bone (which 

 should afterwards be given to 

 him). 



It is also profitable to 

 train the animal so that he 

 learns to associate a certain 

 sound or visual impression 

 with the subsequent stimula- 

 tion of salivary secretion, as 

 by giving him bread crumbs. 

 The experiments on con- 

 ditioned reflexes are however 

 more striking when the fistula 

 is one involving the sub- 

 maxillary or sublingual ducts. 

 The exact nature of the 

 demonstrations and experi- 

 ments on material of this 

 type must naturally vary with 

 circumstances. Advanced 

 students may profitably de- 

 vote considerable time to this 

 work. 



The Normal Secretion 

 of Gastric Juice. Satis- 

 factory demonstration of the 

 secretory activities of the 

 gastric glands requires the 

 establishment of both gastric 

 and cesophageal fistulae on the same animal. 



secretion should be observed 



Stomach cannula. See context for 



This can be under- 



