24 BULLETIN NO. 2, DIVISION OF ENTOMOLOGY. 
Experiment 2, July 24, 4.30 p. m.—Applied to another hill in the labora- 
tory one-half pint of emulsion B. July 25,10 a. m., four fifths of the 
bugs were dead. Those alive were almost entirely under clods, and 
some here were also dead. On the 26th and 27th about forty bugs were 
found to be alive, and all the remainder dead. On a hill treated with 
water at the same time no effect was produced. 
Experiment 3, July 25, 3.30 p. m.—Applied seven pints of emulsion B 
to eighteen hills of corn in the field, selecting those worst affected. The 
weather was very hot and dry. The solution was applied with a hand 
force-pump. The hills treated were surrounded by fence boards placed 
on edge and daubed plentifully with fresh coal tar, to prevent interfer- 
ence from outside. On the 26th, at 11.30-a. m., about four-fifths of the 
bugs were entirely dead. At5 p.m. of the 27th the situation was un- 
changed. 
Experiment 4, July 28, 11 a. m.—A bill of corn in the laboratory was 
treated with half a pint of emulsion C. At 5p. m. the bugs were all 
dead but about a dozen. On the 29th, at 11a. m., could find but four 
that showed signs of life. On the 31st of Julyfourteen bugs were alive 
and at work on the stalks. 
Experiment 5, July 28, 7 p. m.—I treated thirteen hills of corn in the 
field with emulsion C, applying half a pint to each hill. The following 
night was cloudy but dry. On the 29th, at 9 a. m., nine-tenths of the 
bugs were dead, and those alive were nearly all under clods. On the 
29th, at 5 p. m., from 90 to 95 per cent. were dead, piled up in masses 
everywhere upon the corn and ground. August 2,5 p. m., on compari- 
son of these hills with others adjacent, I found that the bugs upon the 
latter were about five times as numerous as those upon the hills which 
had been treated. From this and the preceding experiments I infer 
that the bugs were still hatching. 
Experiment 6.—I spread upon a glass slide as thin a layer of emulsion 
D as I could apply with a camel’s hair brush, and allowed five bugs to 
crawl over it. Four, whose bodies were reached by the fluid, died in an 
hour, but the one remaining was unaffected. 
Haperiment 7, August 1, 12 m.—Applied half a pint of emulsion E to 
~w hill in the laboratory. August 2, 8 a. m., from one-half to two-thirds 
of the bugs were dead, and those alive were collected upon the highest 
points of ground. August 4, at 8 a. m., probably three-fourths of the 
bugs were found to be dead. 
EHexperiment 8, August 1, 12 m.—Applied one-half pint of emulsion D. 
August 2,9 a. m., nine-tenths of the bugs were dead. Those alive were 
nearly all on the ground. This dilution with soap-suds holds much 
better than that with water. 
Experiment 9, August 1,12 m.—Applied half a pint of emulsion F. 
August 2, 8 a. m., one half of the bugs were dead ; the others were on 
the ground and on stalks. On the 4th of August nearly all were dead. 
The three above experiments were intended to test the comparative 
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