19151 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



533 



more injurious than is ether vapor under the conditions of 

 the experiment. Equal amounts of each might give different 

 results, however. The gas used was a mixture of water- and 

 coal-gas with a specific gravity of .62 as compared with air; 



So 



■° 35 



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Fig. 6. Conductivity curves of cultures (series 11) in distilled water 

 subsequent to treatment, as follows: No. 51, ether vapor, 30 minutes, 

 roots in tumbler; No. 52, control — under bell jar 30 minutes, roots in 

 tumbler; No. 53, ether vapor, 1 hour, roots in tumbler; No. 54, con- 

 trol — under bell jar 1 hour, roots in tumbler; No. 55, ether vapor, 2 

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

 tumbler. The plants were 25 days old at the time of treatment. In 

 culture 55, 60cc. of the initial lOOcc. of ether remained at the end 

 of the 2 hours. The following periods represent the time elapsing in the 

 various cultures between the removal of the cultures from the bell jar 

 and the taking of the first reading (to which period should be added the 

 duration of treatment, for the roots were in the distilled water durin 

 that time also) : No. 51, 1 hour and 24 minutes; No. 52, 1 hour an 

 46 minutes; No. 53, 1 hour and 51 minutes; No. 54, 2 hours and 6 

 minutes; No. 55, 1 hour and 39 minutes; No. 56, 1 hour and 50 minutes. 



one of the daily samples analyzed by the gas company (the 

 officials of which kindly supplied the writer with the data and 

 informed him that they may be considered an approximately 

 fair average) showed the following constituents: 



C0 2 3.0% 



2 5% 



Illuminants (unsaturated hydrocarbons, e. g., ethylene and 



acetylene ) 7.0% 



CO 10.1% 



CH 4 25.6% 



H 2 42.8% 



N 2 5.0% 



