1915] 



MERRILL DISTILLED WATER 495 



it rose considerably. The growth curve showed a rise the 

 first ten days, then a decline. 



(k). Higher conductivity in the distilled water after 20 

 days was caused by plants which had not previously been in 

 full nutrient solution than by plants grown for a time in full 

 nutrient solution before transference to distilled water. The 

 former cultures also failed to give the decline in conductivity 



characteristic of normal plants transferred from full nutrient 

 solution to distilled water. 



(1). Greater deterioration of the roots in distilled water 

 occurred if the plants had not previously been in full nutrient 

 solution than in the case of plants which had been grown for 

 a time in the latter medium. 



(m) . Initial difference of temperature of the distilled water 

 produced no effect on the exosmosis of electrolytes. 



The sincere thanks of the writer are cheerfully extended 

 the following, who have generously aided in various ways in 

 the preparation of this paper: Dr. B. M. Duggar, for his 

 helpful suggestions and criticisms throughout the work; Dr. 

 J. F. Merrill and Prof. Lindley Pyle, for suggestions in regard 

 to some features of the conductivity apparatus; Mr. C. H. 

 Thompson, for the photographic work ; and Mrs. Amy Lyman 

 Merrill, for assistance in making the calculations, plotting 

 the curves, and in numerous other wavs. 



Literature Cited 



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Boehm, J. (75). Uber den vegetabilischen Nahrwerth der Kalksalze. Sitzungs- 

 ber. d. k. Akad. d. Wiss., Wien, math.- naturw. CI. 71 : 287-304. 1875. 



Bokorny, T. ('05). Das Kupfer und die Giftwirkung des destilliertcn Wassers. 

 Chemiker-Zeit. 29:087-688. 1905. 



Boussingault, J. (74). Sur la rupture de la pellicule des fruits exposes a une 

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