4 BOTANICAL GAZETTE [JULY 
each of the ingredients, P,O,, NH,, and K.,,O,as shown in the diagram. 
Each side of the triangle is divided into ten equal parts, and lines are 
drawn connecting these points.s In the diagram, for the sake of 
ready reference, the intersections of these lines have been numbered. 
If we consider the line representing the base of the triangle, it is obvious 
that the point which represents 100 per cent K,O (number 56 in the 
diagram) represents at the same time o per cent NH,, and the point 
100 per cent NH, (number 66) likewise represents o per cent K,O. 
If we take a point half-way between these two points, for instance 
point 61, we have a mixture of the two salts in equal proportions; 
i.e., the fertilizer constituents represented by that point will be 50 per — 
cent K,O and 50 per cent NH,. Similarly, point 16 represents 50 
per cent K,O and 50 per-cent P,O., and point 21 represents 50 per 
cent NH, and 50 per cent P,O,. If we take a point nearer to either 
of the corners, we will have a higher percentage of that ingredient 
and a correspondingly lower percentage of the other. For instance, 
at the point 59 the composition is 70 per cent K,O and 30 per cent — 
NH,; at 29 it is likewise 70 per cent K,O, but 30 per cent P,O,; at 
64 it is 20 per cent K,O and 80 per cent NH,; at 45 it is likewise — 
80 per cent NH,, but 20 per cent P,O,. . 
As stated above, points on the base line 56 to 66 represent mixtures 
containing no P,O,. The next line above this, namely 46 to 55, 
represents mixtures containing throughout 1o per cent P,O,, but 
varying amounts of the other two constituents. Similarly, the line 
37 to 45 represents throughout 20 per cent mixtures of P,O,; line — 
29 to 36, 30 per cent mixtures of P,O,; and so on upward until point — 
1, the apex of the triangle, is reached, where the composition is 100 
per cent P,O,, as already explained. Similarly, points on the line r 
to 66 represent o per cent K,O; line 2 to 65 represents ro per cent 
K,O, but varying amounts of P,O, and NH,; and so on until at 
point 56 the composition is too per cent K,O. Likewise, points on 
the line 1 to 56 represent o per cent NH,; line 3 to 57 represent 
ro per cent NH,, but varying amounts of P,O, and K,O; and so on 
until at point 66 the composition is 100 per cent NH,. It is obvious, 
5 Such diagrams for physical chemical work, giving still finer rulings, 
namely: 
100 to each line, can be purchased from the Cornell Co-operative Society, and wer! ©. 
used in these investigations. 
