61 
Experiment 5.—On the 28th, a half pint of emulsion ‘C” was 
thrown upon a hill in the laboratory, at eleven in the forenoon. At 
5 P. M., the bugs were all dead but about a dozen. A careful 
search of the ground and corn three days later discovered but four- 
teen bugs. 
Experiment 6.—In order to ascertain whether anything was gained 
by an application of the emulsion at night, I treated carefully 
thirteen hills in the field with emulsion ‘“‘C,” applying about half a 
pint to each hill, at 7 P. M., of the 28th. The night was warm 
and dry, and next morning at 9 o’clock nine-tenths of the bugs 
were dead. Those alive were nearly all under the clods, where 
some of the groups were molting. A few, accidentally protected by . 
a fold of a leaf, escaped entirely. Pupz were apparently affected 
as easily as younger individuals. On the 29th, at 5 P. M., it was 
estimated that ninety to ninety-five per cent. were dead, scattered 
everywhere on the corn, behind the sheaths and exposed on the 
stalks and leaves, and on the ground at the base of the hill. Most 
of those alive were on the stalks, but some were yet under clods, 
and even in them. On the 2d of August, at 5 P. M., it was con- 
cluded that four-fifths of the bugs were finally killed, while the 
others were back behind the sheaths of the corn at work as usual. 
Experiment 7.—On the 31st of July, 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. 
Eaperiment 8.—Upon the same day five ounces of emulsion ‘D” 
were applied to a hill of corn in the laboratory, at 9 A. M. At 
5 P. M., about ninety per cent. of the bugs were dead. 
EKzpervment 9.—August 1, at 12 M., half a pint of emulsion “K” 
was applied to a hill in the laboratory. On the 2d, at 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 have been 
killed. 
Hapervment 10.—August 1, 12 M., applied one half pint of emul- 
sion “D”. August 2, 8 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. 
Expervment 11.—At 12 M., of the Ist, half a pint of emulsion 
“FR” was also appled. On the 2d, at 8 A. M., one-half of the bugs 
were dead, the others were on the ground and on the stalks. On 
the tth of August nearly all were dead. 
The three experiments just described were intended to test the’ 
comparative efficiency of water, soapsuds and a solution of potash, 
as diluents of the emulsion. The first effects were evidently in favor 
of soapsuds, showing that this is at least most prompt in its action. 
The comparison of final effects was interfered with by the fact that 
at about this time the bugs on all the hills commenced to die 
indiscriminately, as already detailed, , 
