The Augmented Salivary Secretion (Abstract of Paper). — 

 By B. p. Babkin, M. D., D. Sc. and P. D. McLarren, M. D. 

 Department of Physiology, Dalhousie University, Halifax, 



. N. S. 



(Presented 19 April, 1926) 



1. An augmented secretory effect from stimulation of the 

 sympathetic nerve after previous stimulation of the same nerve 

 and massage of the submaxillary gland in dog, was demonstrated. 



2. Contraction of the Warthon's duct and its chief divi- 

 sions, in the dog as well in as in the cat, is excluded as causative 

 of the phenomenon of augmented secretion. 



3. The volume-time curves and, derived from them, the 

 rate curves of the salivary secretion show that diiferent pro- 

 cesses — secretory and motor — may occur in the submaxillary 

 gland under stimulation of the chorda tympani and sympathetic 

 nerves. 



4. The chorda tympani nerve, of a dog and a cat, contains 

 only secretory fibres. The sympathetic nerve contains secre- 

 tory and also motor fibres for the contractile elements of the 

 submaxillary gland. 



5. A view is advanced that there are two phases in the 

 augmented sympathetic secretion, — a mechanical phase due to 

 the action of motor fibres in the sympathetic nerve, and a secre- 

 tory phase which appears as a result of previous stimulation of 

 either nerve. 



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