1915] 



MERRILL DISTILLED WATER 



489 



will be noted that both represent the conductivity curve of dis- 

 tilled water containing the roots of seedling peas. The differ- 

 ence mentioned no doubt finds its explanation in the different 

 conditions under which the two series were grown (the series 



40 



35 



30 



bo 



y 



o 



en 



CO 



3 



> 



25 



05 



£20 



o 



15 



10 



5 



2 



4 



6 



8 



10 



Days 



12 



14 



16 



18 



20 



Fig. 3. The conductivity curves for cultures in distilled water 20 

 days — after growth in full nutrient solution for varying periods of time, 

 as follows: Nos. 9-12, 1 day; Nos. 13-16, 5 days; Nos. 17-20, 10 

 days; Nos. 21-32, 20 days; Nos. 33-36, 30 days; Nos. 37-40, 40 days. 

 Nos. 5-8 were grown only in distilled water, while Nos. 1-4 were without 

 plants, consisting only of distilled water. 



