19 1 2] SCH REINER fir SKINNER— FERTILIZER SALTS 43 



in the comparative results obtained in the cultures containing 50 

 per cent and more of the phosphate, nitrate, and potash, respect- 

 ively, in order to see which of these was the most efficient in 

 antagonizing the action of quinone. The results of the grouping 

 of cultures on this basis, made as explained in the preceding experi- 

 ment, is shown in fig. 4. The mainly phosphatic fertilizer com- 

 binations show a relative ffree.n weight of 77 r>er cent of the normal. 



P 2 5 



. G * 4 ' — Showing the relative growth of normal and quinone cultures in solutions 

 hl gh in phosphate, nitrate, or potash, respectively. 



the mainly nitrogenous 67, and the mainly potassic 83. It is 



most efficient 



coming the harmful 



experiment with quinone was repeated, and this time 



solutions were 



-Lnis second quinone experiment lasted from 



tt showed the same creneral slender aDDeara 



cumarin experiment 



