PETERS. — METABOLISM AND DIVISION IN PROTOZOA. 461 



previously determined that a fraction of a minute longer than this was 

 sufficiently injurious to stop locomotion. 



Time .... 

 No. of Paramaecia 

 Ko. of Divisions 

 Mortality . . 

 Mean Result 



On account of their motioi 



the animals were too numerous to be 



counted alive, and they were therefore killed before counting. 



Uxpt. No. 21, Nov. 21, 1901. 



Purpose and method the same as in the preceding experiment. Para- 

 maecia. 



0.167 m. NaCl, 1 min. Control. 



Time hr. 30 hr. hr. 30 hr. 



No. of Paramaecia ... 37 49 40 64 



No. of Divisions .... 13 24 



Mortality i^ 1 



Mean Result 1.32 1.60 



Expt. No. 10, Oct. 30, 1901. 



Hanging-drop preparations 0.01 m. potassic chloride continuously 

 applied in hay infusion. Paramaecia. 



0.01 m. KCl. Control. 



Time ........ da. 1 da. da. 1 da. 



No. of Paramaecia .... 99 103 87 91 



No. of Divisions 4 4 



Mortality 



Mean Result 1.04 1.04 



Expt. No. 19, Nov. 18, 1901. 



Hanging-drop preparations of Paramaecia in hay infusion containing 

 0.0167 m. potassic chloride. 



