13 BOTANICAL GAZETTE [JULY 
order to show this change in ratio of the fertilizer ingredients, the 
triangular diagram is of the greatest-service, for without this it would 
be impossible to get an intelligent idea of what had occurred in the 
solution. In the diagram fig. 5 are given the original ratios of the 
fertilizer constituents, the ratios left in these solutions as shown by 
analysis, and the corresponding ratio of the removed constituents. 
P205 
7.7 
34.8 44.5 
& e 
34.3 44.6 
e e 
38.8 4245 
® e 
29.4 33.6 
® e 
27.0 27.7 36.8 46.2 
* e e e 
Fic. 4.—Showing the average concentration in parts per million of P,O;, NH;, 
and K,O of the solution after the growth of 10 wheat plants; concentration of the 
original solution was 80 ppm 
It may be shown mathematically that these three points lie upon a 
straight line and this is the case in the diagram. 
The large dots in the diagram represent the original ratios corre- 
sponding to the scheme previously explained and given in fig. 1. The 
circles indicate the ratio left in the solution as shown by analysis. The 
other end of the line indicated by an arrow point shows the correspond- 
ing ratio of the removed materials. It must be borne in mind that 
