1915] 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 529 



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Fi#. 4. Conductivity curves of cultures (series 11) in distilled water 

 subsequent to treatment, as follows: No. 39, illuminating gas, 15 

 minutes, roots in tumbler; Xo. 40, control — under bell jar 15 minutes, 

 roots in tumbler; No. 41, illuminating gas, 30 minutes, roots in tumbler; 

 No. 42, control — under bell jar 30 minutes, roots in tumbler; No. 43, 

 illuminating gas, 1 hour, roots in tumbler; No. 44, control — under bell 

 jar 1 hour, roots in tumbler. The plants were 22 days old when treated. 

 The first reading was taken in the various cultures after the roots had 

 been in the distilled water subsequent to the treatment for the following 

 periods (but to these periods should be added the time the cultures were 

 under the bell jar, for the roots were in the distilled water during that 

 interval also) : No. 39, 2 hours and 12 minutes; No. 40, 2 hours and 

 23 minutes; No. 41, 2 hours and 20 minutes; No. 42, 2 hours and 30 

 minutes; No. 43, 2 hours and 11 minutes; No. 44, 2 hours and 23 

 minutes. 



