80 



DAVID G. MOULTON 



tested although at some sites there are marked reversals or declines at 

 this level. Also one lead yielded two curves. But in spite of these pecu- 

 liarities the overall trend is apparent, and it is clear that the peripheral 

 activity is closely related to the bulbar discharges. 



AMYL ACETATE 



:0 -35 



LOG MOLAR CONCENTRATION 



Fig. 10. Stimulus-response curves for amyl acetate derived from a rabbit with 

 a unilateral transection of anterior olfactory areas caudal to the bulb. Sum- 

 mated spike discharges RB 1-3 from the bulb on the side of the lesion ; LB 1-4 

 from the bulb on the opposite side, and P.N. from the cribriform plate region. 

 Numbering begins at the back of the bulb. 



Simultaneous recordings from the 8 points also reveal marked contrasts 

 in the integrated responses to various odors at different sites in the system. 

 Thus, Fig. 11 shows that 2-butanone was an effective stimulus at RB 1, 

 while eugenol had little or no effect. Conversely, activity at LB 2 was 

 hardly influenced by 2-butanone, although eugenol elicited a significant 



