428 Martin : Effect of concextrated solutions 



Further investigations are needed to determine the causes for 

 such an increase in concentration. Whether the substances 

 undergo changes within the cell, and to what extent the changes 

 take place, might be revealed in experiments upon growth of 

 plants in the different solutions. 



The above work w^as carried on in the botanical laboratories of 

 Cornell University, under the supervision of Professor George F. 

 Atkinson, to whom I wish to express my appreciation and thanks 

 for his many helpful suggestions, and his great kindness in read- 

 ing the manuscript of the present paper, 



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