174 BOTANICAL GAZETTE [SEPTEMBER 
RATIOS OF P,0,, NH;, AND K,0 FOUND IN THE VARIOUS CULTURES 
In the diagram fig. 8 are given the original ratios of the ferti- 
lizer constituents, the ratios left in these solutions as shown by 
analysis, and the corresponding ratio of the removed constituents, 
as in the former paper. As before, the large dots in the diagram 
represent the original ratios according to the scheme previously 
P205 
78.1 
Fic. 7.—Average concentration in parts per million of P.O, + NH; + K.0 ye 
the solution after the growth of 10 wheat plants; concentration of original solution 
explained. The circles indicate the ratio left in the solution 5 
shown by analysis, and the other end of the line indicated by 4% 
arrow shows the corresponding ratio of the removed materials. 
In the former experiment without dihydroxystearic acid there 
was a decided tendency for these lines to converge toward a region 
somewhat below the center; that is, the solutions near this central 
area changed least in their ratio, and the farther the ratios were 
