178 aes BOTANICAL GAZETTE [SEPTEMBER 
in the nitrate removal from the cultures. The influence of light 
conditions on different days has already been discussed in the 
previous paper. 
P,05 
K20 NH 
Fic. 11.—Showing the ratio of the original, the final, and the ratio of the loss 
_ of POs, NH;, and K,O from the solution, in the seventh period. 
THE COMPARATIVE EFFECT PRODUCED ON THE DIHYDROXYSTEARIC 
ACID CULTURE SOLUTIONS BY THE FERTILIZER MIXTURES  ~ 
COMPOSED MAINLY OF P,0,, NH,, AND K,0 
RESPECTIVELY 
In the experiment presented, as well as in two other 
both sets of cultures were grown simultaneously, there was 2° 
a more general tendency toward normal development of the pia 
in the presence of dihydroxystearic acid when the culture solutions 
contained all three of the fertilizer substances. It was further 
apparent that there seemed to be a tendency for more normal 
development in a region nearer to the nitrate end. In order to 
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