206 On the Salivary Glands of the Dog and Cat. [Feb. 11, 



thetic effect of the dog. Thus the usual effect is a deflection similar 

 to the chorda effect of the cat, i.e., diphasic, but with this difference, 

 that the first phase is usually larger than the second phase, and not as 

 in chorda excitation, the second larger than the first. This variation 

 is obtained if the accompanying secretion be watery in character, but 

 if, as occasionally happens, it be viscid, then the second phase is 

 larger, and the first phase smaller in amount. 



Atropine in small doses abolishes the first phase, and in doses of 

 10 — 40 mgrms. the second phase, thus showing a very great difference 

 between its action on the sympathetic variation in the cat and dog 

 respectively. 



Thus to sum up our results : — 



In the submaxillary of the dog excitation of the chorda produces a 

 copious slightly viscid secretion, and the electrical effect consists of a 

 large first phase, the second phase being small, and although not 

 always observed is probably always present. 



In the cat a similar excitation produces a copious viscid secretion, 

 and the electrical effect is diphasic, the second phase being usually 

 the larger. 



In the dog, excitation of the sympathetic produces a scanty viscid 

 secretion, and the electrical effect consists of a pure second phase. 



In the cat, excitation of the sympathetic produces a very copious 

 and but slightly viscid secretion, and the electrical effect is diphasic, 

 the first phase being usually the larger. 



In the parotid the results obtained are similar to those in the sub- 

 maxillary. 



In the dog excitation of the tympanic plexus causes the surface of 

 the gland to become negative to the hilus, and the variation is readily 

 abolished by atropine. Excitation of the sympathetic causes the 

 surface of the gland to become positive to the hilus, and the variation 

 is not readily abolished by atropine. 



