1915] 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



537 



diately results, exposures of 1 minute or | minute produce no 

 results. Culture 13 has rather high exosmosis for a control, 



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8. 



Conductivity curves of cultures (series 14) in distilled 

 water subsequent to treatment, as follows: No. 11, temperature of 

 6.5 °C, 3 minutes, roots exposed; No. 12, control — roots exposed to 

 laboratory temperature 15 minutes; No. 13, control — roots exposed to 

 laboratory temperature 30 minutes; No. 14, control — roots exposed to 

 laboratory temperature 5 minutes; No. 15, temperature of — 6.5°C, 

 2 minutes, roots exposed; No. 16, temperature of — 6.5 °C, 1 minute, 

 roots exposed; No. 17, temperature of — 6.5 °C, one-half minute, roots 

 exposed. The plants were 24 days old at the time of treatment. The 

 first reading was taken in each case after the roots had been in the 

 distilled water for exactly 30 minutes subsequent to the treatment. 



