HEAT RESISTANCE OF PARAMECIUM 



219 



TABLE 7 



The effect of M/4OOO CnCU_ on the heat resistance of P. caudatian from an acid 



medium 



means of the above fatal temperature / in M/4000 CaClj 39.53° 



ZONES 1 in controls 41 .55° 



TABLE 8 



The effect of M/lOO NaCl, and of distilled water, on the heat resistance of P. cauda- 

 tum from an acid medium 



IN M/lOO Nacl: sum of three 



EXPERIMENTS 



Totals subjected to each temperature 



Number of deaths 



Percentage dead at given temperature 



IN DISTILLED WATER: SUM OF THREE EXPERIMENTS 



Totals subjected to each temperature. 



Number of deaths 



Percentage dead at given temperature. 



IN controls: unchanged MEDIUM THREE 

 EXPERIMENTS 



Totals subjected to each temperature 



Number of deaths 



Percentage dead at given temperature 



39° 



368 

 

 



395 

 

 



662 

 

 



TEMPER.\TURES 



40° 



308 

 49 

 15.8 



390 



72 

 18.5 



685 

 15 

 o 9 



41° 



299 

 242 



81 



332 

 326 

 95.1 



622 

 190 

 30.5 



42° 



327 

 327 

 100 



429 

 429 

 100 



770 

 770 

 100 



finM/lOO NaCl... . 40.5° 

 MEANS OF THE ABOVE FATAL TEMPERATURE ZONES { in distilled water. . 40.3° 



I in controls 41.1° 



