588 



'J. Frank Daniel 



ceed to experiments which determine the relation that slightly 

 differing strengths bear to different degrees of immunity. 



In a solution of 0.5 per cent the evidence for adjustment to 

 alcohol though sometimes slight is usually clear after a short time. 

 In this strength evidence may be expected which by the end of the 

 fourth day is definite. By this time the degree of immunity pro- 

 duced by two acclimatizing media — for example one of 0.5 per 

 cent and the other of i per cent strength — should be sufficient 

 to be compared, and their differences noted. 



An experiment follows in which animals from 0.5 per cent and 

 I per cent media were tested to 6 per cent killing fluid. Both 

 were further controlled by the resistance of normal animals. 



Experiment IX 



RESISTANCE OF STENTORS OF TYPE F TO 6 PER CENT ALCOHOL AFTER LIVING 4 DAYS IN SOLUTIONS OF 



DIFFERENT STRENGTHS 



A Four Days in I Per Cent Alcohol 



Seconds 

 Exp. I cilia stop 190 



2 cilia Stop 330 



3 cilia stop 140 



4 cilia stop 180 



5 cilia stop 350 



6 cilia stop 160 



7 cilia stop 195 



8 cilia stop 180 



9 cilia stop 240 



10 cilia stop 330 



Average resistance = 229.5 



A Four Days in 0.5 Per Cent Alcohol 



Seconds 

 Exp. I cilia stop 120 



2 cilia stop 185 



3 cilia stop 260 



4 ciUa stop 325 



5 cilia stop 130 



6 cilia stop 80 



7 cilia stop 130 



8 cilia stop 160 



9 cilia stop 200 



10 cilia stop 135 



C Control 



Seconds 



Exp. I cilia stop 130 



2 cilia stop 85 



3 cilia stop 285 



4 cilia stop 160 



5 cilia stop 90 



6 cilia stop no 



7 cilia stop 1 10 



8 cilia stop 265 



9 cilia stop 230 



10 cilia stop 70 



Average resistance = 153.5 



Average resistance = 172.5 



