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_ 1910] SCHREINER & SKINNER—ORGANIC SOIL CONSTITUENT 175 
removed from this central area originally, the more were they 
altered in the course of the experiment. This area was between the 
10 and 20 per cent phosphate line, and the area of greatest growth 
occurred in this same region. It is in this region of greatest growth, 
therefore, that the greater absorption of nutrients took place 
with the least change in ratio; in other words, the solutions repre- 
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Fic. 8.—Showing the ratio of the original, the final, and the ratio of the loss of 
20;, NH;, and K.O from the culture solution; the dots indicate the ratio of the 
constituents in the original solution; the circles show the ratio of the constituents 
in the solution after growth; and the arrows show the ratio of the decrease. 
sented by this region offered the best environment for plant develop- 
ment and the best ratios for the absorption of plant nutrients. 
The diagram shown in fig. 8 for the experiment with dihydroxy- 
Stearic acid shows on the whole a migration of the lines so that 
they point to an area somewhat nearer to the nitrate end of the 
triangle. It will be remembered from the data already discussed 
