RESISTANCE TO HYPOTONIC SEA-WATER 



22g 



other 6 hours, this had fallen to 4,950 ohms for the modified tap- 

 water and to 5,750 ohms for the culture media. Again the liquids 

 were changed to appropriate solutions, each at 7,400 ohms at 19° C. 

 After 24 hours the water from worms just beginning disintegra- 

 tion in the dilute sea-water showed 4,850 ohms resistance, while that 

 from worms in the same condition in the culture medium showed 



TABLE XXV 



Showing the Survival Time, in Hours, of Procerodes Isolated into i Ml. 



Each of Paramecium Hay Infusion and of Dilute Sea-Water 



OF THE Same or Greater Resistivity 



4,950 ohms. Again the surviving worms were changed to water 

 having a resistance of 7,200 ohms for each solution. Ten hours 

 later both showed a resistance of 4,475 ohms. 



The approximate survival time was obtained for 49 worms ex- 

 posed singly to i ml. each of the two solutions whose history has 

 just been given. It will be noted that in no case was the resistivity 

 less in the Paramecium culture medium than in the accompanying 

 control solution. The survival times are summarized in Table 

 XXV, in which Control I is used to mean the modified tap-water 



