PETERS. — METABOLISM AND DIVISION IN PROTOZOA. 



45T 



Time. . . . 

 No. of Stentors 

 No. of Divisions 

 Mortality . . 

 Mean Result . 



A control experiment was made with a similar U-cell in which the 

 Stentors were treated merely with tap-water for twenty minutes, a period 

 of time equivalent to that of the test experiment. The animals were 

 then transferred, as hefore, to a portion of their native culture medium, 

 free from other Stentors, and mounted in hanging drops. These prepa- 

 rations were set away simultaneously with the test preparations and were 

 kept under the same room conditions. The only essential difference of 

 which I am aware between test and control experiments was the tem- 

 porary treatment of the former with 0.05 m. potassic chloride. The 

 control gave the following results : 



Expt. No. 7, Oct. 24, 1901. 



Test experiment similar to Experiment No. 6. Culture medium made 

 to contain 0.05 m. potassic chloride applied to Stentors for ten minutes. 



The control made aa described under Experiment No. 6, yielded the 

 following results: 



