54 
following day eighty per cent, of the bugs were dead, together with 
several adult blister-beetles {Bpicauta marginata) and Colorado po- 
tato-beetles treated at the same time. 
In another test like the preceding, except that the bugs were ex- 
posed to the blast for two seconds, eighty per cent, were dead the 
following day. A third experiment duplicated the first with a result 
to kill eighty-five per cent, of the bugs. In a fourth cage the flame 
was held for a second two inches from the bugs, and the following 
day seventy-five per cent, of the two hundred and fifty treated were 
found to have been killed. At a distance of four inches the flame 
killed but ten per cent., the remainder crawling about, apparently 
uninjured, twenty-four hours later. An adult potato-beetle and two 
larvae of the same, a common cabbage-worm, and a caterpillar of 
the cabbage Plusia were likewise uninjured by this treatment, In 
another experiment it was shown that if the burner were held three 
seconds at a distance of four inches from the insects, only ten per 
cent, of the chinch-bugs were killed. 
A thousand chinch-bugs were next exposed to a gentle blast of 
the gasoline flame until they were all unable to crawl. On the fol- 
lowing day about fifty of them were still able to move, although the 
legs and other appendages of some of these were scorched. 
In order to ascertain whether the bugs might die from the after- 
effects of the blast, a thousand specimens in another cage were sub- 
jected to an extreme scorching heat without killing them at the time. 
On the following day at least half of them crawled away, evidently 
uninjured. Another lot of a thousand were flamed until a third 
were killed outright, the remainder being rapidly flamed several 
times but left able to crawl away. On the following day at least 
two thirds of the bugs were alive. From these experiments it ap- 
pears that bugs not killed at the time of treatment do not ordinarily 
die thereafter. A lot of two thousand chinch-bugs or more, col- 
lected from corn and confined in a similar cage, which were kept as 
a check during the course of these experiments, lived with less than 
one per cent, of loss, and these were probably injured in collecting. 
To determine the resisting power of the corn to the hot blast 
of the gasoline torch several plats, equally infested and all in one 
field, were treated variously. The flame was moved over the plants 
sometimes quickly, sometimes slowly, and was sometimes held 
close to the leaves, sometimes at a greater distance. In this experi- 
ment the unit was a plat of a hundred hills of corn, which averaged 
three feet high at the time. All plats were treated in the afternoon 
of July 30, the weather being clear and hot, with a little wind. The 
lamp was used at a high pressure, produced by two hundred sue- 
