ODOR SPECIFICITIES OF THE FROG S OLFACTORY RECEPTORS 



29 



Fig. 10. Several units with clearly different amplitudes can be seen in all the 

 traces shown here and in Fig. 11. A small unit responds vigorously to geraniol, 

 ethyl butyrate, and amy! alcohol. A smaller unit is active as well for geraniol. 

 A large unit responds slightly to ethyl butyrate. This unit also responds to 

 amyl alcohol slightly, as does another slightly smaller unit. All sweep lengths, 

 10 sec. Except for geraniol the stimuli are too small to discriminate the slow 



potential. 



Fig. 11. From the same position as the traces shown in Fig. 10, the two large 

 units respond to benzaldehyde, benzonitrite, and musk xylene. There is little 

 or no response of the small units to these stimuli. Same sweep length as in 



Fig. 10. 



