30 



R. C. GESTELAND AND OTHERS 



Fig. 12. A unit is shown in these four traces which responds strongly to butyric 

 acid, valeric acid, and cyclo-hexanol. There is a weak response to /?-butanol. 

 Base-line drift is caused by movement of the micropipette electrode. Sweep 



lengths, 10 sec. 



iitbenl 



Fig. 13. A unit that responds to musk xylene, slightly to nitrobenzene, less so 

 to benzonitrite, and not at all to pyridine. Sweep lengths, 10 sec. 



