206 
the various solutions, nothing different from what had been previously 
observed was noted. As yet not a sign of rust had been seen on any 
of the plants. It was noticed that the plants sprayed with ferrous 
ferrocyanide, Bordeaux mixture, and ammoniacal solution of copper 
carbonate were much greener than any of the others. This difference 
in color of foliage, due to the applications of chemicals in the form of 
spray, is, however, not peculiar to wheat. It has frequently been seen 
in the case of similar work upon other crops, but no attempts have 
been made to explain it. 
Sixteenth treatment (May 6*, 1892 ).—On May 1 rust was found on 1 
of the untreated plats, a few pustules being seen on the leaves of sev¬ 
eral stalks arising from one root. It was decided to make no fur¬ 
ther examination until May 6, the day for the regular treatment. At 
this time, therefore, every plat was examined and the number of plants 
showing rust was counted. The rust was noted as being present if 
only one pustule occurred on a plant. The counting entailed an enor¬ 
mous amount of work, bnt it was the only way the desired knowl¬ 
edge could be obtained. The plants in all of the original plats averaged 
at this time from 15 to 18 inches in height, and in most respects were 
in good condition. Below is given, in tabular form, the results of the 
count on May 6. 
Table 2. —Showing number of plants affected with rust on Mag 6. 
SERIES I.—SOIL TREATMENT. 
Plat, 
Method of treating. 
No. of plants 
showing rust. 
Total 
plants 
showing 
rust. 
Origi¬ 
nal. 
Dupli¬ 
cate. 
Origi¬ 
nal. 
Dupli¬ 
cate. 
1 
91 
Untreated. 
27 
0 
27 
2 
92 
Flowers of sulphur,4 ounces to 20 feet of row.. 
50 
40 
90 
3 
93 
Untreated. 
25 
0 
25 
4 
94 
Flowers of sulphur, 2 ounces to 20 feet of row .. 
40 
0 
40 
5 
95 
Untreated. 
0 
0 
0 
6 
96 
Flowers of sulphur, 1 ounce to 20 feet of row_ 
26 
0 
26 
7 
97 
Untreated... 
29 
16 
45 
8 
98 
Flowers of sulphur and lime, equal parts mixed, 
4 ounces to 20 feet of row. 
21 
0 
21 
9 
99 
Untreated.. 
0 
2 
2 
10 
100 
Flowers of sulphur and lime mixed, 2 ounces to 
20 feet of row.. 
4 
0 
4 
11 
101 
Untreated. 
18 
0 
18 
12 
102 
Ferrous sulphate, 4 ounces to 20 feet of row. 
15 
0 
15 
13 
103 
Untreated. 
31 
0 
31 
14 
104 
Ferrous sulphate, 8 ounces to 20 feet of row. 
12 
0 
12 
15 
105 
Untreated. 
56 
0 
56 
16 
106 
Bordeaux mixture, | gallon to 20 feet of row. 
37 
0 
37 
17 
107 
Untreated. 
21 
0 
21 
18 
108 
Potassium sulphide, \ ounce to b gallon of water 
to 20 feet of row. 
31 
0 
31 
19 
109 
Untreated. . 
93 
0 
93 
20 
no 
Ammoniacal solution, £ gallon to 20 feet of row. . 
61 
0 
61 
21 
111 
Untreated.. 
5 
0 
5 
22 
112 
Bordeaux mixture, \ gallon to 20 feet of row.. 
7 
0 
7 
23 
113 
Untreated. 
1 
49 
50 
24 
114 
Potassium bichromate, 1§ ounces in 1J quarts 
water per plat. 
rl ear] 
25 
115 
Untreated. 
47 
0 
47 
