Immunity of Lotuer Organisms to Ethyl Alcohol 607 



Johnson^* has shown that the process of regeneration in Stentor 

 is similar to what occurs in the intricate process of division. 

 In the cases of loss of the peristome which I have just described, 

 however, no active condensing and separating of the nodes of the 

 meganucleus took place. A part of the body simply constricted 

 off and the meganuclear nodes were seemingly undisturbed. 



2 Effects upon Resistance 



The animals in the following experiment were reared in i per 

 cent alcohol and then tested in comparison with control specimens 

 to a molecular solution of glycerin: 



Experiment XVIII 



RESISTANCE OF STENTOR AND SPIROSTOMUM TO ^ GLYCERIN, AFTER ACCLIMATIZATION IN I PER CENT 



ALCOHOL 



a Stentor 



A 



Acclimatized to 



I per cent 



Alcohol 



Seconds 



Exp. I cilia stop i8o 



2 cilia stop 240 



3 cilia stop 150 



4 cilia stop 120 



5 cilia stop 100 



6 cilia stop 135 



7 cilia stop 205 



8 cilia stop 190 



9 cilia stop 150 



10 cilia stop 165 



Average resistance. = 163.5 



h Spirostomum 

 C AC 



Control Acclimatized to Control 



I per cent 

 Alcohol 



Seconds Seconds Seconds 



240 Exp. I cilia stop 120 240 



450 2 cilia stop 240 180 



255 3 cilia stop 150 240 



330 4 cilia stop 180 300 



285 5 cilia stop 180 200 



300 6 cilia stop 210 240 



250 7 cilia stop 180 240 



340 8 cilia stop 200 180 



225 9 cilia stop 180 250 



3CX) 10 cilia stop 210 240 



297.5 Average resistance. = 185 231 



While, as we have before seen, no difference either in behavior 

 or in chemical action could be detected as between unacclimatized 

 and acclimatized animals, yet in this study on comparative resist- 

 ance a difference was noticed. In a solution of the above strength 

 both cases gave clear evidence of the specificity of the immunity 



' Johnson, Herbert P., 1893, Jour, of Morphol., viii, pp. 467-562. 



