The electrical phenomena 



accompanying the process of secretion in the salivary glands 



of the dog and cat 



by 

 W. M. Bayliss B. Sc, and J. R. Bradford B. Sc. *)'. 



(From the Physiological Laboratory, University College, London). 



(Continuation.) 



When recording experiments were made, the saliva was allowed 

 to drop from the end of the cannula on to a cover glass fixed at the 

 end of the lever of a Marey's tambour, each drop being thus registered 

 by aid of a recording tambour. Vertically below the latter a signal 

 was arranged, and as the observer at the galvanometer called out a 

 deflection, a mark was made by the second observer with the signal, 

 upon the same moving surface on which the saliva was being recorded. 

 At the same time the amount of the deflection was noted down by the 

 first observer, and at the end of the experiment was inscribed on the 

 blackened surface at its appropriate place. In this manner a simul- 

 taneous record of the galvanometric deflections and of the saliva se- 

 creted was obtained, and from these records it is was possible to 

 construct curves, showing the relative course of both the electrical and 

 secretory processes. 



Electrical conditions of the submaxillary gland during rest. 



Dog. — The outer surface of the gland is in the great majority 

 of cases negative to the hilus, both when examined as above described, 

 and also when the gland is removed from the animal, with one 

 electrode placed on the hilus and the second on the outer surface. 



In four experiments out of twenty -four the outer surface of the 

 gland was positive. In two cases the outer surface was at first posi 



