524 



A.H. Estabrook 



TABLE XXXIII 



Measurements of growth in J per cent alcohol 



not at any time grow as fast in the alcohol as in the control ( see 

 table XXXIII). At 12 hours, all those in the alcohol were dead. 



Growth in 2 per cent alcohol. At the age of 90 minutes, Para- 

 mecia had grown to normal length, but were not so thick as the 

 controls. At 5 hours, they were slightly shorter in length and 

 much thinner than the controls (see table XXXIV). At 24 hours, 

 those in the alcohol measured 196. i X 56.5 microns, and had not 

 divided at all, while the controls had increased from 22 to 42 

 specimens. Thus in 2 per cent alcohol animals had grown to 

 about normal size, but did not divide. The effect of the alcohol 

 is shown mainly on the inhibition of division. 



Growth in I per cent alcohol. At the end of 90 minutes, Para- 

 mecia growing in i per cent alcohol were slightly larger than the 

 controls. At 5 hours and at 24 hours those in the alcohol had 

 grown to the same size as the controls. Thus i per cent alcohol 

 has no effect upon the growth (see table XXXV). 



Growth in i-^OO alcohol. As was mentioned above, it has been 

 found by certain investigators that minute quantities of alcohol 

 cause increased rate of division. In order to see if increased size 

 accompanied this greater division rate, the effects of more dilute 

 solutions of alcohol were tried upon growing Paramecia. 



Paramecia grew to exactly the same size in the 1-500 alcohol 

 as in the control (see table XXXVI). 



Growth in 1-2,^00 alcohol. In a solution of I part alcohol in 

 2,500 of hay infusion, Paramecia grew to the age of 5 hours, at the 



