44 INJURIOUS INSECTS OF I909Q AND I9QIO. 
heated several times during the application and each time it was 
heated to about 140 degrees Fah. At times the temperature got 
down as low as 115 degrees Fah. during the process of application. 
In all there were 590 plants treated in this way, and 368 check 
plants were included in the experiment. The tanglefoot was heated 
in the following manner: The pails containing it were placed in a 
large kettle over a fire, and when melted up the tanglefoot was 
poured out into a pail and allowed to cool to a satisfactory tempera- 
ture, and then applied with a spoon. In this crude way much more 
tanglefoot was necessarily applied to the bases of the plants than 
should have been required, and so the expense was much greater 
than it should have been. Furthermore, it was impossible to place 
the tanglefoot exactly in the position that was desirable, and so a 
ereat deal was daubed on the leading leaves, causing the death of 
the plants. It seems not altogether improbable that if a better 
means of applying the tanglefoot (perhaps by some double-boiler 
arrangement with a spout running out from it) could be devised, 
that this material could be applied in such a way as to make the 
treatment not very expensive, and so that it would not harm the 
plants seriously. Also such a method of application might save 
re-heating the tanglefoot several times, and so save time in applica- 
tion. Pains were taken to surround the bases of the plants entirely 
with the tanglefoot on all sides, and have it run out a full inch 
away from the bases of the plants on every side. 
On May 28th the plants in this experiment were examined, and 
it was found that, out of the 590 treated plants, 360 had been killed, 
apparently by the tanglefoot treatment. The plants which had 
survived were retained and examined from time to time, for the 
purpose of seeing if the tanglefoot could stop the maggots, even 
if it could be made otherwise successful. 
It must be remembered, in figuring up the proportion of the 
plants which died in the treated rows, that a considerable number 
of plants also perished in the check rows, so that probably many 
plants would have died even 1f the tanglefoot had not killed them. 
The check rows had lost, by May 28th, about 40 out of the 368 
plants. The plants in this experiment were pulled up, a few on 
June oth, a few on June roth, and a few on June 19th, but most of 
them were pulled up on June 21st and 22d. When pulled. they 
were examined, and the infested and non-infested ones of each row 
of treated and check plants were both counted. The total results 
were as follows: 
