J. J. SKINNER AND F. R. REID 
of P2O5, NH3, or K2O respectively. The line of cultures from I to 66 
contains mixtures of P2O5 and NH3 in 10 percent differences; the line of 
cultures from i to 56 contains mixtures of P2O5 and K2O in 10 percent 
differences; the line of cultures from 56 to 66 contains mixtures of K2O and 
NH3. The cultures in the interior of the triangle contain mixtures of all 
three constituents, differing in. 10 percent stages one from the other, the 
composition depending upon its position in the triangle; those nearer the 
P2O5 apex consisting chiefly of phosphate salt, those nearer the NH3 apex 
chiefly of nitrate salt, and those nearer the K2O apex chiefly of potash salt. 
For a more detailed explanation of the scheme and principles involved, 
the reader is referred to the earlier papers. 
In table i is given the composition of the solution represented by each 
of the 66 points in the diagram. 
Table i 
The composition of the sixty-six nutrient solutions, the constituents P2O5, NH3, and K2O 
varying in 10 percent stages 
Point 
No. 
P. p.m. P 
resent in Solution 
Point 
No. 
P. p.m. Present in Solution 
Point 
No. 
P. p.m. Present in 
Solution 
P2O5 
NH3 
P.O5 
NH3 
K2O 
P2O5 
NH3 
K2O 
I 
80 
0 
0 
23 
32 
8 
40 
45 
16 
64 
0 
2 
72 
0 
8 
24 
32 
16 
32 
46 
8 
0 
72 
3 
72 
8 
0 
25 
32 
24 
24 
47 
8 
8 
64 
4 
64 
0 
16 
26 
32 
32 
16 
48 
8 
16 
56 
5 
64 
8 
8 
27 
32 
40 
8 
49 
8 
24 
48 
6 
64 
16 
0 
28 
32 
48 
0 
50 
8 
32 
40 
7 
56 
0 
24 
29 
24 
0 
56 
51 
8 
40 
32 
8 
56 
8 
16 
30 
24 
8 
48 
52 
8 
48 
24 
9 
56 
16 
8 
31 
24 
16 
40 
53 
8 
56 
16 
10 
56 
24 
0 
32 
24 
24 
32 
54 
8 
64 
8 
II 
48 
0 
32 
33 
24 
32 
24 
55 
8 
72 
0 
12 
48 
8 
24 
34 
24 
40 
16 
56 
0 
0 
80 
13 
48 
16 
16 
35 
24 
48 
8 
57 
0 
8 
72 
14 
48 
24 
8 
36 
24 
56 
0 
58 
0 
16 
64 
15 
48 
32 
0 
37 
16 
0 
64 
59 
0 
24 
56 
16 
40 
0 
40 
38 
16 
8 
56 
60 
0 
32 
48 
17 
40 
8 
32 
39 
16 
16 
48 
61 
0 
40 
40 
18 
40 
16 
24 
40 
16 
24 
40 
62 
0 
48 
32 
> 19 
40 
24 
16 
41 
16 
32 
32 
63 
0 
56 
24 
20 
40 
32 
8 
42 
16 
40 
24 
64 
0 
64 
16 
21 
40 
40 
0 
43 
16 
48 
16 
65 
0 
72 
8 
22 
32 
0 
48 
44 
16 
56 
8 
66 
0 
80 
0 
Two sets of these 66 solutions were prepared, one set containing the 
crotonic acid. The culture solutions were contained in wide-mouth 
bottles and 10 wheat plants were grown in each culture after the manner 
described in the papers cited. The solutions were changed every three 
days, four such changes being made in each experiment and analyzed imme- 
diately after each change for nitrates, but the phosphates and potash were 
determined on a composite of the four changes. The green weight of the 
plants was determined at the termination of the experiment. 
1 
