390 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
Data. In order to discover which seeds were most susceptible to car¬ 
bon bisulphide treatment a number of kinds of seed were treated with 
1.6 cc. per jar (68 pounds per thousand cubic feet) for twenty-one days. 
The results are given in Table 1. 
As a result of this treatment there is every gradation from no effect 
whatever in the case of corn and alsike clover to a total loss of germina¬ 
tion in the case of buckwheat, black T eyed peas and navy beans. 
As a result of this preliminary test systematic tests varying the length 
and severity of the exposure were started with corn, wheat, buckwheat 
and navy beans. The results are given in the following tables: 
Table 2. Corn Treated with CS 2 Vapor 
Dose 
7 
Number of days exposure 
14 21 28 
42 
56 
.6 cc. 
100 
98 
93 
100 
100 
100 
1.6 cc. 
99 
100 
100 
Average check germination 100. 
Table 3. Wheat Treated with CS 2 Vapor 
Dose 
Number of days exposure 
2 
4 
8 
16 24 
32 
64 
.2 cc. 
.98 
100 
99 
97 96 
98 
96 
.4 cc. 
.98 
99 
98 
99 90 
99 
98 
.8 cc. 
.97 
98 
99 
100 92 
99 
98 
1.6 cc. 
.99 
97 
96 
99 76 
95 
92 
3.2 cc. 
.98 
93 
87 
93 62 
95 
31 
Saturated atm.. . 
.86 
85 
73 
73 20 
29 
0 
Average check germination 99. 
Table 4. Buckwheat Treated with CS 2 Vapor 
Dose 
2 
4 
Number of days exposure 
8 
16 
24 
.2 cc. 
. .98 
99 
99 
95 
94 
.4 cc. 
. .98 
96 
97 
99 
96 
.8 cc. 
. .93 
99 
97 
96 
96 
1.6 cc. 
. .95 
100 
95 
99 
97 
3.2 cc . 
. .95 
94 
100 
94 
93 
Saturated atm.. , 
. . .96 
95 
91 
87 
71 
Average check germination 99. 
Table 5. Navy Beans Treated with CS 2 Vapor 
Dose 
2 
4 
Number of days exposure 
8 
16 
24 
.2 cc. 
. .84 
86 
90 
76 
70 
.4 cc. 
. .86 
78 
86 
76 
66 
.8 cc. 
. .88 
78 
86 
74 
64 
1.6 cc . 
. .83 
68 
76 
68 
32 
3.2 cc . 
. . .82 
70 
56 
56 
1 
Saturated atm. . , 
. . .67 
42 
30 
6 
0 
Average check germination 85. 
