18 
kerosene plot are 40 percent in hills infested -by ants, 45 percent in 
those infested by aphids, 59 percent in number of ants, and 69 percent 
in number of aphids. In the formalin plot the benefit for hills infested 
by ants and by aphids was 37 percent for each, .and the benefit in 
number of ants in the plot was 49 percent, and in number of aphids, 
61 percent. In the carbolic acid plot, on the other hand, the numbers 
of hills infested by ants and by aphids were somewhat larger than 
in the check. 
Inspections of May and June, 1906 
Percent of Hills infested 
II 
Check 
Oil of 
lemon 
Kerosene 
Carbolic 
acid 
Formalin 
By ants: 
After lydays 
After 43 ' ' 
57 
73 
23 
22 
31 
44 
49 
76 
33 
46 
By aphids: 
After 19 days 
After 43 " 
53 
73 
14 
20 
20 
40 
39 
74 
28 
46 
Insects to the Hill 
Check 
Oil of 
lemon 
Kerosene 
Carbolic 
acid 
Formalin 
Ants: 
After 19 days 
After 43 " 
66 
39 
9 
8 
16 
16 
25 
32 
30 
20 
Aphids: 
After 19 days 
After 43 " 
23 
166 
2 
18 
3 
52 
12 
139 
6 
64 
Percentages of Benefit from various Treatments 
Oil of lemon 
Kerosene 
Carbolic acid 
Formalin 
Benefit in hills infested 
After 19 days 
After 43 days 
By 
By 
By 
By 
ants 
aphids 
ants 
aphids 
60 
74 
70 
73 
46 
62 
40 
45 
14 
26 
00 
00 
42 
47 
37 
37 
1 
Benefit in No. of insects 
After 19 days 
Ants 
86 
76 
62 
55 
Aphids 
83 
87 
52 
74 
After 43 days 
Ants 
79 
59 
18 
49 
Aphids 
80 
69 
15 
61 
