[Vol. 2 



556 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



effect on exosmosis and that the conductivity 



ulting 



from treatment with N/10 CaCU should rise so high at the end 



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75 



70 



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 I 55 



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£ 50 



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40 



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35 



30 



25 



20 



15 



10 



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3 



5 



7 



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11 



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Days 



Fig. 18. Conductivity curves of cultures (series 10) in distilled 

 water subsequent to treatment, as follows: No. 21, N/10 NaCl, 75 

 hours; No. 22, N/10 KC1, 75 hours; No. 23, N/10 NaCl plus N/10 

 KC1, 75 hours; No. 24, N/20 NaCl plus N/20 KC1, 75 hours; No. 25, 

 N/10 NaCl plus N/10 CaCl->, 75 hours; No. 26, N/10 KC1 plus N/10 

 CaClo, 75 hours; No. 27, N/20 NaCl, 75 hours; No. 28, N/20 KC1, 

 75 hours; No. 29, control — distilled water, not renewed; No. 30, con- 

 trol — distilled water, not renewed. The plants were 21 days old when 

 treated. The first reading was taken after the roots had been in the 

 distilled water 30 minutes (in No. 29, 75 hours). Culture 30 was 

 placed in distilled water at the end of the 75-hour period, having been 

 in full nutrient solution up to that time. 



