23 
in a field near Elliot, and the results were ascertained April 22, when 
the corn was from 3 to 5 inches high. All the test hills surrounding 
the ants' nests, including both check and experimental plantings, were 
thoroly infested by ants and root-lice where the seed had been pre- 
viously treated by rolling it in lime or sulphur, by soaking for 10 
minutes in a saturated solution of chlorid of lime, and by soaking for 
10 minutes in a 10 percent mixture of the "Rex Dip." In the lime 
experiment, 5 hills were planted immediately surrounding an ant's 
nest, one of these being reserved as a check ; in the sulphur experi- 
ment, 4 hills were so planted ; and in that with chlorid of lime, 4 hills. 
In that with "Rex Dip," 7 hills were planted around 2 separate nests 
of the ant. The results of these experiments thus agree with those of 
our more general test of plot plantings in the field. 
As a test of the formalin treatment of the seed, 2 ants' nests were 
surrounded by 7 hills of corn, 3 around one and 4 around the other. 
In each case one of the hills was planted with untreated seed, and the 
seed for the others was soaked in a 4 percent solution of formalin, — 
for those around one nest for 5 minutes, and for those around the 
other for 10 minutes. After 17 days, both check and experimental 
hills were all completely and uniformly infested by the ants. 
In an experiment with the oil of lemon, 4 hills were planted around 
another ant nest, three of them with treated grains and one as a 
check. Here also all the hills were infested May 22. 
In a corresponding experiment with kerosene, 10 hills were planted 
so as immediately to surround 2 nests of the ants, two of these hills 
being reserved as checks and the other eight planted with corn which 
had been moistened with kerosene by putting a single drop to a dozen 
grains and rolling these together until all were oily. By the 22d of 
May one of these nests was completely abandoned by the ants, which 
had apparently formed another nest about three feet away. There 
were no aphids on roots of either check or experimental hills. The 
other nest was still occupied, and there were a few aphids on the 
roots of the check, but none of either ants or aphids on the experi- 
mental hills. 
Finally, two nests were surrounded by 8 hills, 6 of which had been 
treated with a 3 percent solution of carbolic acid — in the one case 
soaking for 5 minutes and in the other for 10. In the former case 
the roots of the check hill were covered with root-lice attended by a 
few ants, while those of the three experimental hills had neither ants 
nor aphids on them. In the latter case the ants had abandoned their 
nest, and neither checks nor experimental hills were infested. 
These results differ, it will be seen, from those of the plot plant- 
ings in the fact that, while carbolic acid and kerosene apparently 
kept the insects out of the treated hills for three weeks, oil of lemon 
and formalin, as well as a number of other substances tested, were 
without effect. 
