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. 
Percentage of insects dead within- 
3 days. 
GO 
O 8 
6 days. 
M 
O 8 
Commercial acid lead arsenate 
Sample 39 plus Bordeaux mixture 
(61) 
Sample 39 plus lime-sulphur (60). . 
Commercial calcium arsenate 
Sample 57plus Bordeaux mixture 
(61) 
Sample 57 plus lime-sulphur (60). . 
Laboratory sodium arsenate 
Sample 25 plus Bordeaux mixture 
„ (61).- -,-..; '--; 
Commercial zinc arsenite 
Sample 23 plus Bordeaux mixture 
(61) 
Control with food 
91.0 
78.0 
56." 6 
52.0 
99." 6' 
77.0 
96.0 
83.0 
.0 
11.0 
7.4 
6.5 
8.4 
3.3 
4.2 
28.8 
3.7 
12.5 
.0 
18.1 
11.3 
34.0 
14.4 
10.1 
37.4 
33.8 
68.9 
68.1 
.6 
21.0 
12.0 
12.6" 
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."6" 
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 
58.0 
46.0 
44*6 
20.0 
62." 6 
53.0 
44.0 
54.0 
12.0 
78.3 
68.3 
74.8 
57.2 
46.7 
57.2 
81.4 
72.4 
69.4 
Arsenicals and control. 
Percentage of insects dead 
within— 
Toxicity for— 
Ave 
toxi 
foi 
rage 
city 
10 days. 
d 
% 
a 
03 
1 
CO 
CD 
CO 
1 
6 
o 
a 
be 
g 
> 
< 
CO 
1 
O 
& 
M 
w 
co 
s? 
O 8 
,0 
E 
i 
& 
CD 
O 
l 
CO 
CD 
a 

tn 
CO 
o 
5 
•d • 
CI g 
*i 
co o. 
"Sg 
39 
91 
Commercial acid lead arsenate . . . 
Sample 39 plus Bordeaux mb* 
ture(61) 
100.0 
99.3 
87.0 
88.5 
65.4 
47.5 
76.0 
96.6 
91.3 
60.9 
70.9 
2.6 
100.0 
100.0 
99.6 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
100.0 
23.1 
99.8 
95.7 
94.0 
87.5 
81.5 
88.0 
98.9 
97.1 
87.0 
90.3 
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 
66.8 
66.5 
74.2 
62.4 
60.8 
76.9 
76.0 
76.0 
88.6 
88.8 
39.5 
29.0 
66.1 
58.2 
63.9 
55.6 
93 
Sample 39 pluslime-sulphur (60). 
Commercial calcium arsenate — 
Sample 57 plus Bordeaux mix- 
ture (61) 
63.0 
57 
92 
97.0 
97.0 
28.0 
16.0 
50.8 
43.7 
48.0 
40.8 
94 
Sample 57 pluslime-sulphur (60). 
Laboratory sodium arsenate 
55.3 
25 
47.5 
36.5 
34.5 
36.0 
72.3 
62.7 
64.7 
63.5 
71.0 
55 
Sample 25 plus Bordeaux mix- 
ture (61) 
100.0 
61.1 
?3 
62.8 
54 
Sample 23 plus Bordeaux mix- 
ture (61) 
100.0 
.0 
62.7 
Control with food 
1 Based on mortahties for third and sixth days only. 
GENERAL AVERAGE TOXICITY. 
Four arsenicals without Bordeaux mixture and lime-sulphur (jjH JSSStoKSS 
Four arsenicals with Bordeaux mixture {£} ftMggwg ^ caterpiUars)- 
Two arsenicals without lime-sulphur, 56.0 (webworms and tent caterpillars). 
Two arsenicals with lime-sulphur, 59.1 (webworms and tent caterpillars). 
^61.4 (webworms and tent caterpillars). 
