62 
Experiment 12.—At 2 P. M., on August 2, half a pint of emul- 
sion ‘‘D” was applied to the worst hill in the laboratory. August 
38, at 9:30 A. M., nine-tenths of the bugs were dead; the others 
were scattered on the ground. August 4, 8 A. M. ninety- five per 
cent. of the bugs were dead, and the others were still torpid on the 
ground. 
Experiment 13.--On the 2d, at 5 P. M., applied one-half pint of 
emulsion ‘‘F’”’ to a hill in the laboratory. At 10 A. M., on the 3d, 
fully ninety per cent. of the bugs were dead. 
Experiment 14.—The next experiment was made on the 2d of Au- 
gust, at 5 P. M., when a half-pint of emulsion ‘‘C” was applied to 
several hills of corn in the field. At 11 A. M. on the following day, 
nine-tenths of the bugs were found to be dead. 
Experiment 15,—On the 18th of August one of my assistants, Mr. 
A. B. Seymour, applied a quart of emulsion ‘“D” to four hills of 
corn at noon, stirring the mixture just as it was applied, and at 6 
Psi Me _ nearly all the bugs were found to be dead. 
Bipernent 16.—He next applhed a quart of emulsion ‘“‘H” to 
three hills of corn at 6 P. M., with equal effect. 
Experiment 17.—In another Sepenirnele made on the 19th of Au- 
gust, with the same fluid, ninety to ninety-five per cent. of the bugs 
were found dead three days later. A half-pint was poured upon each 
hill from « common garden sprinkler. 
Experiment 18.—On the 22d he sprinkled upon different hills equal 
quantities of emulsions ‘‘D” and ‘‘H,” and found, two days later, 
that about ninety-five per cent. of the bugs treated with emulsion 
“1” were dead, and about three-fourths of those upon which emul- 
sion ‘‘H” had been used. 
Experiment 19.—On the 18th he made a mechanical mixture of 
one part of kerosene to twenty parts of the second solution, applying 
one quart to two hills of corn at noon, sprinkling the entire plant. 
At 6 P. M. nine-tenths of the bugs were dead, and no injury to the 
corm appeared. © 
Experiment 20.—On the 22d, at -2 M., he made an experiment to 
compare the effects of an emulsion of soapsuds, one of fresh milk, 
both diluted with clear water, and also the simple mixture of kero- 
sene and soapsuds. He applied them with a sprinkler, and exam- 
ined the hills at 9 A. M. of the following day, when all the fluids 
used were found to have been about equally effective, destroying 
from ninety to ninety-five per cent. of the bugs. 
Experiment 21.—In a final trial, two hills each were treated at the 
same time with one-half pint of emulsions es? eli? SOB? ary Glee 
and with mechanical mixtures of kerosene and water—one contain- 
ing two and one-half per cent. of kerosene and the other three and one- 
half per cent. The result of this experiment showed that the soap 
emulsion was a little less effective than that with milk (‘‘H” de- 
stroying only about +ixty per cent. of the bugs, while ““B” kllled 
eighty per cent.), and that the simple mixtures were the most 
effective of all. That containing one pint of kerosene to forty of 
water, killed eighty per cent. of the bugs, while the mixture of one 
to thirty killed ninety-eight per cent. 
