Effects of Alcohol on Paramedian 205 



ture of the laboratory was allowed to run low on holidays and Sun- 

 days there was a marked lowering of the division rate which 

 affected all the cultures alike. This temporary check always dis- 

 appeared when the temperature came back to the normal state. 



CONCLUSIONS 



Our experiments show that: 



1. There is no evidence that alcohol acts as a periodic or con- 

 tinued stimulus. 



2. There is no evidence that the general vitality would decrease 

 under the constant stimulus of minute doses. 



3. Alcohol in minute doses, 2 per cent or less, has no effect 

 whatever. 



4. When a medium dose is given, for example 3 per cent, the 

 general vitality is weakened. 



5. If alcohol is given in greater strength than 3 per cent the 

 rate of division is lowered and the organisms finally die. 



LITERATURE 



(i) Gary N. Calkins and C. C. Lieb '02 — Studies on the Life-History of 



Protozoa. 



2. The Effects of Stimuli on the Life-Cycle of Paramecium 



caudatum, Archiv fiir Protistenkunde. 

 (2) LoRANDE Loss WooDRUFF 'o8— Effects of Alcohol on the Life Cycle of 



Infusoria, Biological Bulletin, vol. 15, no. 2, July. 



