512 



A.H. Estabrook 



TABLE XVII 



E^ecl of di^erent strengths of nicotine upon Paramecta. 100 specimens each in watch glass at beginning of 



experiment. 



TABLE XVm 



Dimensions of Paramecia that have remained $0 hours in various strengths of nicotine compared with con- 

 trols; measurements are in micorns, and each is the average taken from 50 specimens. 



At beginning of experiment. 



Control at end 



1-40,000 



1-80,000 



1-100,000 



It is seen that the Paramecia in the nicotine were about the 

 same size at the end of the experiment as they were at the begin- 

 ning. The controls, however, had increased in size from 219.4 X 

 46.3 microns to 260.7 x 67.5 microns. This would seem to indi- 

 cate that those in the nicotine did not grow at all durng the period 

 of the experiment. 



