1915] 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



527 



90 



85 



80 



75 



70 



dge 



65 



* — * 





tH 





*a 







60 



o 





m 





c3 



55 



* 50 



° 45 



40 



I 



> 35 



30 



25 



20 



15 - 



10 



2 



4 



6 



8 



10 



12 

 Days 



14 



16 



18 



20 



22 



24 



Fig. 3. Conductivity curves of cultures (series 11) in distilled water 

 subsequent to treatment, as follows: No. 33, illuminating gas, 15 

 minutes, roots exposed; No. 34, control — roots exposed under bell jar 

 15 minutes; No. 35, illuminating gas, 30 minutes, roots exposed; No. 36, 

 control — roots exposed under bell jar 30 minutes; No. 37, illuminating 

 gas, 1 hour, roots exposed; No. 38, control — roots exposed under bell jar 

 1 hour. The plants were 22 days old when treated. The first readings 

 were taken in the various cultures after the roots had been in distilled 

 water for the following periods: No. 33, 35 minutes; No. 34, 1 hour and 

 15 minutes; No. 35, 1 hour and 13 minutes; No. 36, 1 hour and 25 

 minutes; No. 37, 1 hour and 5 minutes; No. 38, 1 hour and 16 minutes. 



