February, ’20] NEWELL: POISONING THE BOLL WEEVIL 
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Table III. Per Cent Mortality Among Boll Weevils on Calcium-Arsenate Treated Plants: 
(A) Protected from Dew and Rain, and (B) Exposed to Dew and Light Rains, During 
First 10 Days After Treatment 
A 
B 
24-hour period after application 
Protected from dew and rain 
Exposed to dew and light rains 
Treated 
(250 weevils 
in 3 cages) 
per cent 
Check 
(250 weevils 
in 3 cages) 
per cent 
Treated 
(500 weevils 
in 6 cages) 
per cent 
Check 
(500 weevils 
in 6 cages) 
per cent 
1st. 
8.8 
0 
13.6 
1.4 
2nd. 
14.0 
0 
15.4 
1.4 
3rd. 
19.2 
2.8 
11.6 
1.2 
4th. 
10.8 
0 
8.6 
1.4 
5th. 
4.8 
0.4 
5.8 
1.4 
6th. 
6.0 
2.4 
4.0 
2.0 
7th. 
6.4 
0.4 
4.6 
.4 
8th. 
3.2 
2.8 
4.8 
1.8 
9th. 
3.2 
2.4 
3.0 
3.2 
10th. 
2.4 
2.8 
2.4 
3.0 
Totals. 
78.8 
14.0 
73.8 
17.2 
The following chart shows the above information in graphic form, 
i. e., the daily mortality on treated plants protected from dew and 
rain and on treated plants exposed to normal precipitation. 
PER CEHT 
Chart 3.—Daily mortality, in percentages, among weevils on cotton plants treated 
with calcium arsenate: heavy line (A), among 250 weevils on plants protected from 
dew and rain; broken line (B), among 500 weevils on plants exposed to normal 
deposition of dew and rain. 
Chart 4 shows in graphic form the total percentage of mortality as 
given in Table III and Chart 3. 
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