ARSENICALS. 
35 
Table 16. — Effect on toxicity of adding Bordeaux mixture and lime-sulphur to arsenicals 
on four species of insects, 1920. 
Arsenicals and control. 
3 days. 
€ 
days. 
o 
<D 
! 
co 
1 
| 
bo 
o 5 
fit 
CD 
CO 
| 
% 
o 
d 
<o 
Eh 
as 
»• fi 
d 
o 
w 
tt) 
<S 
o 
> 
< 
1 
| 
0Q 
g 
co 
s? 
o 8 
fi 
© 
co 
is 
& 
<» 
u 
1 
EH 
i 
§ 
8, 
> 
< 
39 
91 
Commercial acid lead arsenate 
Sample 39 plus Bordeaux mixture 
(61) 
91.0 
78.0 
11.0 
7.4 
6.5 
8.4 
3.3 
4.2 
28.8 
3.7 
12.5 
9.1 
.0 
18.1 
11.3 
34.0 
14.4 
10.1 
37.4 
36.6 
33.8 
68.9 
68.1 
.6 
21.0 
12.0 
"l2."6" 
12.0 
"33."6" 
20.0 
25.0 
18.0 
.0 
35.3 
27.2 
20.2 
22.7 
19.3 
20.8 
49.3 
33.6 
•50.6 
44.5 
100.0 
99.0 
"85." 6' 
83.0 
"ioo.'o" 
99.0 
100.0 
95.0 
.0 
72.8 
40.0 
60.7 
27.1 
11.7 
21.0 
72.2 
43.5 
37.5 
30.0 
.0 
82.2 
88.1 
88.9 
72.8 
72.2 
93.5 
91.4 
94.2 
96.9 
98.4 
8.8 
58.0 
46.0 
*44."6" 
20.0 
"62."6" 
53.0 
44.0 
54.0 
12.0 
78.3 
68.3 
93 
Sample 39 plus lime-sulphur (60). . 
74.8 
57 
92 
Commercial calcium arsenate 
Sample 57plus Bordeaux mixture 
(61) 
56.0 
52.0 
57.2 
46.7 
94 
Sample 57 plus lime-sulphur (60).. 
57.2 
25 
55 
Laboratory sodium arsenate 
Sample 25plus Bordeaux mixture 
(61) 
99.0 
77.0 
96.0 
83.0 
.0 
81.4 
72.4 
23 
54 
Commercial zinc arsenite 
Sample 23 plus Bordeaux mixture 
(61) 
69.6 
69.4 
Control with food 
Arsenicals and control. 
Percentage of insects dead 
within — 
10 days. 
03 
CO 
sq- 
£ 
u § 
OS 
£t, 
o 
fi 
CD 
d 
£ 
Eh 
99.3 
100.0 
87.0 
100.0 
88.5 
99.6 
65.4 
100.0 
47.5 
100.0 
76.0 
100.0 
96.6 
100.0 
91.3 
100.0 
60.9 
100.0 
70.9 
100.0 
2.6 
23.1 
Toxicity for — 
OQ 
O 8 
fi 
K 
Average 
toxicity 
for— 
CO d, 
£2 
Commercial acid lead arsenate . . , 
Sample 39 plus Bordeaux mix- 
ture(61) , 
Sample 39 pluslime-sulphur (60) 
Commercial calcium arsenate — 
Sample 57 plus Bordeaux mix- 
ture (61) 
Sample 57 pluslime-sulphur (60) 
Laboratory sodium arsenate 
Sample 2& plus Bordeaux mix- 
ture (61) 
Commercial zinc arsenite 
Sample 23 plus Bordeaux mix- 
ture (61) 
Control with food 
100.0 
*97."6 
97.0 
100.0 
99.8 
95.7 
94.0 
87.5 
81.5 
88.0 
98.9 
97.1 
87.0 
100.0 
.0 
97.0 
92.3 
79." 3 
77.3 
99.*7 
92.0 
98.7 
92.7 
61.0 
44.8 
51.9 
33.6 
20.8 
33.7 
65.9 
46.2 
37.0 
36.7 
66.5 
74.2 
62.4 
60.8 
76.9 
76.0 
76.0 
39.5 
29.0 
28." 6" 
16.0 
47*5" 
36.5 
34.5 
36.0 
66.1 
58.2 
50." 8 
43.7 
72." 3' 
62.7 
64.7 
63.5 
63.9 
55.6 
63.0 
48.0 
40.8 
55.3 
71.0 
61.1 
62.8 
62.7 
1 Based on mortalities for third and sixth days only. 
GENERAL AVERAGE TOXICITY. 
Four arsenicals without Bordeaux mixture and lime-sulphur {g;| [^XrmJSStent caterpillars). 
Four arsenicals with Bordeaux mixture {g° ^HZrZ S tent caterpillars). 
Two arsenicals without lime-sulphur, 56.0 (webworms and tent caterpillars). 
Two arsenicals with lime-sulphur, 59.1 (webworms and tent caterpillars). 
