ig 1 2] 



SCHREINER & SKINNER— FERTILIZER SALTS 



41 



see what the effect of an organic compound having oxidizing prop- 

 erties would be on plants growing in these various fertilizer com- 

 binations. For this purpose quinone, shown to be toxic to wheat 

 seedlings in a former research, was chosen, inasmuch as it is an 

 oxidizing substance and therefore in strong contrast to the vanillin 

 with its decided reducing properties. This fundamental difference 



R>o 



Fig. 3. — Showing the relative growth of normal and vanillin cultures in solutions 

 high in phosphate, nitrate, or potash, respectively. 



show 



compounds, it was thought, should 



ence of two such widely different poisons, and the scope of the 



experiment 



lend itself to showing such differences in metabolism or fertilizer 



requirement, and thus throw some 



oxidizin 



experiments 



