508 ■ ACTION OF NICOTINE ON SQUID 



SUMMARY, 



1. In specimens of freshly hatched squid, Loligo pealii, nicotine 

 acts upon the cerebral ganglia alone. 



2. After 1 minute in the nicotine solution 1:500,000, the latent 

 period for the mantle spasm is independent of the time spent in the 

 solution. 



3. The mantle spasm is conditioned by a chemical reaction, since 

 the temperature coefficient of the process has a magnitude of about 2.8. 



4. The velocity of the process which brings about the mantle spasm 

 varies as the cube root of the concentration of the nicotine. 



