252 



R. L. KITCHELL 



the other substances. In calves, lambs, and goats the magnitude of res- 

 ponse to the application of 0.2 m acetic acid to the tongue was approxi- 

 mately equal or sHghtly less than the response to 0.5 m sodium chloride. 



PiS 6L0SS0PHARYN6EAL NERVE 



«4^ 



^4^ 



i^^^fc^ 



1 SIC. 



Fig. 15. Records from the whole lingual branch of the glossopharyngeal nerve 

 of a pig. Recording procedure same as for Figs. 13 and 14 except the Ringer's 

 solution was applied to the tongue approximately 10 sec before each record 

 was made. A, Ringer's solution. B, Distilled water. C, 0.46 m sucrose in 

 Ringer's solution. D, 0.5 m sodium chloride in Ringer's solution. E, 0.02 m 

 quinine hydrochloride in Ringer's solution. F, 0.2 m acetic acid in Ringer's 

 solution (Kitchell, unpublished). 



In these animals the application of 0.46 m sucrose to the tongue resulted in a 

 response of low magnitude, as recorded by the integrator, but of long 

 duration (Fig. 1 1). In the dog and the pig, the application of 0.46 m sucrose 

 to the tongue resulted in a response of greater magnitude as compared to 

 the response produced by 0.5 m sodium chloride (Fig. 13). 



The application of 0.02 m quinine hydrochloride to the tongue produced 



