1915] 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



525 



In figures 1 and 2 are shown the results of treatment with 

 ether and illuminating gas for varying periods of time. The 

 plants for this experiment were 39 days old at time of treat- 

 ment and had roots in good condition and well developed. The 



60 



55 



50 

 •C 45 



o 40 



02 





35 



0) 



5 30 



O 



s 25 



o 



I 



> 



v 20 



15 



10 



5 



1 



2 



3 



4 



5 



6 



7 



Days 



Fig. 2. Conductivity curves of cultures (series 11) in distilled water 

 subsequent to treatment with anesthetics, as follows: No. 27, illuminat- 

 ing gas, 5 minutes, roots exposed; No. 28, illuminating gas, 10 minutes, 

 roots exposed; No. 29, illuminating gas, 15 minutes, roots exposed; 

 No. 30, control — roots exposed under bell jar 15 minutes; No. 31, ether 

 vapor, 3 hours, roots in tumbler; No. 32, control — under bell jar 3 hours, 

 roots in tumbler. The plants used were 39 days old. The first reading 

 in each case is of the distilled water before the roots were placed in it. 



first conductivity readings of the water were taken before the 

 plant roots were introduced. As seen from the plotted re- 

 sults the ether had no effect on the exosmosis when the dura- 

 tion of the exposure ranged from 1 to 15 minutes; after 3 



