8 BULLETIN 893, U. S. DEPARTMENT OF AGRICULTURE. 
The results in Table 5 show that the action of cyanogen chlorid as. 
an insecticide is practically the same as that of hydrocyanic acid. 
A preliminary series of germination tests run on several varieties 
of seeds showed that for the most part but little Injury was done the 
seeds which were exposed to cyanogen chlorid for six hours at 1 per 
cent concentration, or for two hours at 3 per cent concentration. 
Exposure for more than six hours, however, affected injuriously the 
germination quality. 
Consequently, a longer series, with exposures 
not exceeding six hours, was run. The results thus obtained are 
reported in Table 6. 
TABLE 6.— Effect of cyanogen chlorid on seed germination. 
Kind of seed. 
Wiest, ;Atnontikal 2: 2) aN ee ee eee ; 
WiheateKeharkoos .o.20.. 5h ee oe Pe 
Via ree ATO LIS=-ee ss co ee eyes Saree ee Sah 
iuineaieWihite Australian... t.. 27.2 sae) eee eee 
Check. | 
Per cent. 
(S55 
Cr Or 1 orOr1 or Or1S O11 © Or Or Ovo1or 1 O10 O1O © O11 Ot SO CLO N OO Ooo o1o on 
or 
Or 
Germination. 
1 per cent concen- 
tration. 
concen- 
tration, 
1 hour 
concen- 
iy 
1 hour 
_ 3 hours (temp. 
| (temp. 23°C. 
23 (C= 232 € 
relative 
humidity, humidity, 
40; atmos- 40; atmos- 
| pherie | pheric 
| pressure, | pressure, 
| normal). 1 normal). 
| ] 
Telative | relative 
‘humidity, humidity, 
‘40; atmos- 22; atmos- 
pheric pheric 
pressure, | pressure, 
normal). | vacuum), 
Per cent. 
Per cent. | Per cent. | Per cent. 
24.5 27.0 26. 0 Devs 
|) Sus 77.5 85.5 86. 5 
| 81.0 76. 0 82. 5 90. 0 
| 92.0 91.5 96. 0 97.0 
18. 5 72.5 75.0 74.5 
84. 25 82.5 83.75 63. 5 
86. 75 86. 5 86.5 87.5 
92.75 92.0 92. 25 92. 25 
82.5 Ue 80. 5 73.5 
89.5 91.5 93.5 93. 5 
86. 5 85. 0 85.5 86. 0 
88. 0 84.5 88. 0 85. 0 
1.5 as The) Ls 
80.0 89.75 85. 0 85. 5 
70.0 74. 25 78.5 68. 5 
Pic & 20. 5 27.0 25. 0 
83. 0 73.0 80. 0 68. 5 
94.5 97.5 96. 0 90.5 
72.0 78. 5 7BY 72.0 
43.0 eos: 29.5 29. 0 
35.5 29.5 37.5 34.5 
66. 0 76. 5 COs 71.0 
69. 0 59. 5 67.0 ; 61.5 
78.0 86. 0 86. 5 90.5 
82.5 90. 5 84.5 82.5 
14.5 64. 5 78.5 81.0 
79. 5 78. 0 81.0 Ma 
92.5 92.0 95. 5 96. 5 
97.5 96. 5 97.0 97.5 
84.0 85. 5 87.5 90. 0 
90. 0 89.5 92.5 85. 0 
97.0 92.5 97.0 83. 5 
81.0 75.0 87.5 58. 0 
DA 20.5 18. 5 16.5 
59.0 88. 0 89. 0 95. 0 
73.0 94.0 64. 0 97.0 
54.5 56. 0 62. 75 52. 25 
Ss 33.0 26. 0 33.5 
81.0 85. 0 65. 0 89. 0 
84. 5 92.5 84.0 86. 5 
99. 5 99.0 98. 5 96. 0 
83.5 73.0 84. 0 82.0 
51.0 42.5 59.5 58. 0 
53. 0 41.5 40.5 40.0 
5a 46. 0 63. 0 57.0 
3 percent; 1 percent. 
