1915] 



MERRILL — ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



531 



85 



80 



75 



70 



65 



to 





rs 







60 



d> 





C 





o 





m 



55 



i 





% 



50 



V 





A 





P 



45 



o 





H 





o 



40 



s 





3 





"3 

 5> 



35 



30 



25 



20 



15 



10 



2 



4 



6 



8 



10 



12 



14 



16 



18 



20 



22 



Days 



Fig. 5. 



Conductivity curves of cultures (series 11) in distilled 

 water subsequent to treatment, as follows: No. 45, ether vapor, 30 

 minutes, roots exposed; No. 46, control — roots exposed under bell jar 

 30 minutes; No. 47, ether vapor, 1 hour, roots exposed; No. 48, con- 

 trol — roots exposed under bell jar 1 hour; No. 49, ether vapor, 2 hours, 

 roots exposed; No. 50, control — roots exposed under bell jar 2 hours. 

 The plants were 25 days old at the time of treatment. In culture 49, 

 17cc. of the initial 50cc. of ether remained at the end of the 2 hours. 

 The first reading plotted in each case was taken after the roots had 

 been in the distilled water subsequent to the treatment for the follow- 

 ing periods: No. 45, 1 hour and 1 minute; No. 46, 1 hour and 12 

 minutes; No. 47, 1 hour and 27 minutes; No. 48, 1 hour and 38 

 minutes; No. 49, 1 hour and 17 minutes; No. 50, 1 hour and 28 

 minutes. 



