50 



DON TUCKER 



event, narrow bandwidth amplification is useful for maximizing the signal- 

 to-noise ratio. The fidelity of reproduction is low as a consequence, but 



f^^ %>» ^» ><^ W m^lt l^t *\ 



-0.1 MV 



100 MSEC 



Fig 5 Response to butyl acetate recorded 19 hr later from the preparation of 



Fig. 4. 



little is gained by extending the upper frequency limit because of the 

 increase in noise. Records obtained (a.c. and d.c.) simultaneously from an 

 olfactory twig estimated to be 30/t in diameter are shown in Fig. 6. The 

 animal was tracheotomized and for each odor a brief puff of air was directed 



