PHYSIOLOGICAL STUDIES OF GUSTATORY MECHANISMS 249 



chicken (Kitchell, Strom, and Zotterman, 1959) and the monkey (Gordon, 

 Kitchell, Strom and Zotterman, 1959). These findings have been con- 

 firmed in other laboratories (see Fig. 12, Kitchell unpublished ; chickens, 



DOG CHORDA TYMFANi NiSVI 



HMMMMIMMMI 



„ „ _^„_ „ ■*» . .Pii Wll.. ...J . J Ill 



Fig. 12. Records from the whole chorda tympani of a dog. Recording pro- 

 cedure same as in Fig. 11 and 14 except Ringers solution was applied both 

 before and after the test solution. X indicates 4 sec segment deleted. A 

 indicates 5 sec segment deleted. A, Distilled water. B, 0.005 m sodium chloride. 

 C, 0.05 M sodium chloride. D, 0. 1 m sodium chloride. E, 0.5 m sodium chloride 

 (Kitchell, unpublished). 



Halpern and Kare, 1961). A neural response to the application of distilled 

 water has not been detected in the rat (Fishman, 1957), sheep, goats, and 

 calves (Baldwin, Bell, and Kitchell, 1959, and Bell and Kitchell, un- 

 published ; see Fig. 11), and in man (Diamant and Zotterman, 1959). In 

 some animals a distilled water response may be recorded from the chorda 

 tympani nerve but not from the lingual branch of the glossopharyngeal 

 nerve (cat, dog, and rabbit, Appelberg, 1958 ; pig, Kitchell, unpubHshed, 

 see Fig. 15). The monkey is the only animal studied to date in which a 

 distilled water response has been detected in both nerves (Appelberg, 

 1958). 



