Immunity of Lower Organisms to Ethyl Alcohol 585 

 Experiment VIII 



RESISTANCE OF STENTORS OF TYPE E TO 6 PER CENT ALCOHOL AFTER LIVING IN I PER CENT 

 ALCOHOL. A=ANIMALS THAT HAVE LIVED IN ALCOHOL. C = CONTROL ANIMALS 



Average resistance = 261.5 



254 



281 



265-5 



297 



258.5 



The outcome of this series adds Httle, if any, evidence for accHm- 

 atization. While in the three cases the animals of A, as in preced- 

 ing experiments, show a slight increase in resistance, this is not 

 sufficiently high, with a possible exception of the seventh day, to 

 be at all convincing. 



In summarizing the entire work done upon type E, it will be 

 recalled that when reared for different periods of time either in 

 weak or in stronger percentages of acclimatizing media and tested 

 to different strengths of the killing fluid, this type gave consider- 

 able increase in resistance in only a few cases. A discussion of its 

 tolerance may, therefore, be confined largely to a consideration of 

 the first two (III and IV) and to the last experiment (VIII). The 

 others, although often positive, fall easily within the possible 

 experimental error, and may, as a consequence, be classed as un- 

 convincing. 



Since what is true for III is true also for Experiments IV and 

 VIII, our study may further narrow itself down to a consideration 

 of Experiment III alone. 



The highest increase found during the entire study of E is that 



