ARSENICALS. 
39 
Table 18. — Relative toxicity ofneiv arsenates on 5 species of insects, 1920. 
Arsenates and control. 
Percentage 
Df insects dead within— 
3 days. 
6 days. 
&j 
&3 
to 
&3 
&3 
to 
f 
1 — 
a 
**■* 
w 
ca 
TO ^^ 
w^ 
m 
p. 
TO'"* 
M ^ 
i 
<o 
42 
>> 
<D 
a 
o 
H 
ft 
I 
| 
H 
li 
42 
II 
42 
2 
42 
o 
H 
a 
q 
a> 
Eh 
So 
<» 
l> 
<! 
o 
CO 
SI 
1* 
u 
| 
"5 
o 
a 
Eh 
39 
Commercial acid lead 
arsenate 
91.0 
29.9 
47.6 
21.0 
18.1 
41.5 
100.0 
95.3 
84.2 
58.0 
82.2 
83.9 
71 
Laboratory barium 
arsenate 
22.0 
3.2 
10.9 
11.0 
14.0 
12.2 
68.0 
68.2 
37.3 
18.0 
75.1 
53.3 
74 
Laboratory copper 
barium arsenate 
61.0 
10.0 
11.7 
9.0 
18.1 
22.0 
98.0 
67.5 
57.0 
28.0 
83.2 
66.7 
62 
Commercial magne- 
sium arsenate 
Commercial acid lead 
91.0 
13.8 
5.2 
4.0 
100.0 
85.2 
46.5 
31.0 
70 
arsenate (new proc- 
ess) 
91.0 
32.9 
100.0 
88.2 
73 
Laboratory aluminum 
4.7 
0.0 
7.5 
0.5 
80.8 
0.8 
33.6 
8.5 
Control with food 
6.6 
0.0 
0.6 
6.6 
12.0 
8.8 
Arsenates and control. 
Percentage of insects dead within— 
10 days. 
6 
ft 
1 
02 
TO 
o 
I 
s 
TO '-- 
Si 
IS 
■8 
la 
O H 
■8 
TO 
o3 
ft 
n> 
ta 
CJ 
q 
EH 
SO 
C3 
> 
< 
TO 
1 
M 
42 
s 
si 
TO 
$ 
42 
1 
w 
TO 
[_ 
S3 
'ft 
<u 
o 
1 
EH 
1 
Ml 
< 
39 
Commercial acid lead 
arsenate 
100.0 
88.2 
95.2 
100.0 
99.2 
98.3 
24.7 
100.0 
72.1 
82.7 
83.8 
100.0 
99.0 
100.0 
100.0 
87.8 
94.5 
97.0 
60.7 
86.3 
97.0 
97.0 
75.1 
53.2 
57.6 
66.3 
73.4 
61.3 
77.3 
40.1 
50.5 
45.2 
39.5 
14.5 
18.5 
17.5 
66.8 
62.7 
67.1 
71.1 
71 
Laboratory barium 
arsenate 
92.0 
100.0 
46.2 
74 
62 
Laboratory copper 
barium arsenate 
Commercial magne- 
56.0 
70 
Commercial acid lead 
arsenate (new proc- 
73 
Laboratory aluminum 
80.9 
16.9 
40.7 
Control with food 
0.0 
23.1 
1 Based on mortalities for third and sixth days only. 
COMPARATIVE AVERAGE TOXICITY. 
Sample 39, 72.2; sample 62, 56.5. 
Sample 39, 86.0; sample 70, 85.2. 
Sample 39, 76.2; sample 73, 51.0. 
