SECRETION 



FIG. 93. ELECTRICAL CHANGES IN THE SUBMAXILLARY GLAND OF THE DOG. 



UPP bLek t li > ne CUrVe8 (ab Ve d tted ]ine > chorda stimulation. Period of stimulation marked by thick 



Top curve galvanometer deflection. 



Bottom curve rate of secretion, deduced from the intervals between the drops of saliva marked 



on the hue above the stimulation signal. 

 Lower set of curves sympathetic stimulation. 



Top curve galvanometer deflection. Note that it has an opposite direction to that given on 



chorda stimulation. 

 Bottom curve rate of secretion (approximate). Only one drop obtained. 



(From data by Bayliss and Bradford, 1885.) 



