17 
lice were collected and counted for each hill. For convenience in 
comparison the data will be given in each instance for a hundred 
hills of corn taken as a unit. Those for the early and late plantings 
will be given separately — first those for the parts of the field which 
received the least treatment, and then^ by successive steps, for those 
which were treated most. (See Table III.) 
Tablr IEI. Abstract of Hinman Experiment, 1905. 
(Planted May 8, and May 13 to 15: examined May 31.) 
PJat A, 1 
Plat B, 1 
Plat C, 1 
♦Plowed (1). harrowed 
(2), disked (3), har- 
rowed (4) 
50 hills examined 
Plowed (1). harrowed 
(2), disked twice 
(3, 5), harrowed (4) 
50 hills examined 
Plowed (1). harrowed 
twice (2, 4) 
50 hills examined 
Percent. 
of 
hills 
infested 
Number 
of insects 
per hun- 
dred hills 
Per cent. 
of 
hills 
infe!?ted 
Number 
of insects 
per hun- 
dred hills 
Percent. 
of 
hllis 
infested 
Number 
of insects 
per hun- 
dred hills 
Ants 
54 
40 
2012 
838 
26 
12 
744 
158 • 
64 
48 
2096 
Aphids 
974 
A, 2. Pulverized (6) 
35 hills examined 
B, 3. Pulverized (6) 
25 hills examined 
C, 2. Pulverized (6) 
25 hills exartiincd 
Ants. . . . 
Aphids 
24 
12 
260 
62 
12 

66 

24 
20 
194 
146 
1. Plowed April 7 to 28. 2. Harrowed May 3 and 4. 3. Disked May 5. 4. Harrowed 
May 8. 5. Disked May 8. 6. Pulverized (Acme harrow) May 22 and 23. 
In plat C, with minimum treatment, sixty-four per cent, of 
the hills were infested with ants ; in plat A, with medium treatment, 
fifty-four per cent, were so infested; and in plat B, with maxi- 
mum treatment, the percentage of infestation by ants was twenty- 
six. Forty-eight per cent, of the hills of plat C were infested by 
root-lice ; forty per cent, in plat A ; and twelve per cent, in plat B. 
One hundred hills in plat C contained 2096 ants; in A, 2012; and 
in B, 744. One hundred hills in C contained 974 root-lice; in 
A, 838; and in B, 158. In other words, taking the infestation of 
plat C as a basis of comparison, we find that the single additional 
disking of plat A reduced the number of hills infested by ants to 
eighty-four per cent., and those infested by root-lice to eighty-three 
*See note to Table I., p. 105. 
