BY H. G. CHAPMAN. 



97 



creatic duct by Pawlow when secretion was evoked by stimulating 

 the vagus nerve. 



Tlie secretion evoked by secretin does not seem to be inliibited 

 by stimuhition of the peripheral end of the vagi, although 

 Popielski (supra vide) found the flow evoked by acid in the 

 duodenum to be inhibited by stimulation of the vagus. Neither 

 single slowly-repeated nor rapid farad aic stimulation of the vagus 

 produced any alteration in the rate of secretion, though marked 

 heart inhibition and fall of blood pressure resulted. This is 

 shown in the appended 



curve showing the results of faradaic 



Effect of Vagus Stimulation ox Pancreatic Secretion evoked by Secretin 



IN THE Dog. 



cS II 



Time in minutes : 1 min. =: 2 divisions. 



(a) Injection of 20 c.c. secretin from the cat into right jugular vein. 



Vagi previously divided. 



(b) Faradaic stimulation of peripheral and of left vagus nerve. 



(c) Faradaic stimulation of peripheral and of right vagus nerve. 



stimulation. Mechanical stimulation of the vagus was also with- 

 out result. 



7 



