RESPONSES TO ODORANTS 



49 



had deteriorated sufficiently for the response to butyl acetate to appear as 

 in Fig. 5. There seems to be no way to determine whether discrete activity 



/Vv>-v^^/S^^/^ 





V V / . ,\ 





-0.1 MY 



100 MSEC 



Fig. 4. Continuous record of discrete activity and response to butyl acetate 

 obtained from an olfactory twig of diameter estimated at 12-15//. 



of this nature represents impulses in individual fibers or possibly groups of 

 fibers acting in concert (Adrian, 1956). 



Ten microns in diameter is about the lower limit of size for twigs to be 

 handled readily and some even larger than 100// yield good records. In any 



