592 J- Frank Daniel 



when compared with the effects of a i per cent solution, differences 

 similar to those shown in Experiment IX (p. 588). 



To this end some of the same type which had been kept in a 

 0.5 per cent medium were tested at the same time, with the same 

 control. 



This experiment resulted as follows: 



Experiment XI h 



RESISTANCE OF STEN'TORS OF TYPE F TO 8 PER CENT ALCOHOL, AFTER LIVING 4 DAYS IN O.I PER CENT 



ALCOHOL 



A Four Days in 0.5 Per Cent C Control 



Seconds 

 Exp. I cilia stop 90 



2 cilia stop 120 



3 cilia stop 140 



4 cilia stop 105 



5 cilia stop 180 



6 cilia stop 100 C =111.5 



7 cilia stop 140 



8 cilia stop 160 



9 cilia stop 140 



10 cilia stop 100 



Average resistance = 127 .5 



While the increase is only slightly higher than that of the control 

 yet this is much more constant as will be seen in the slight range 

 of variability (90 to 180 seconds). This constancy shows that in 

 this case also different concentrations produced different degrees 

 of immunity. 



3 General Discussion of Types E and F 



The degree of increase in resistance due to remaining in weak 

 alcohol is as we have seen, very different in the two types E and 

 F. Type E in no place indicated more than a slight and occa- 

 sional evidence of immunity to alcohol. Type F on the contrary 

 gave an increase of resistance which was considerable and con- 

 stant. A low average period of resistance in type F was 229.5 

 seconds, while that of the control was 153.5 seconds (a ratio of 

 1. 495 1 to i). If the same average increase of resistance were 



