de 
wrung out, slightly dried, and placed over the frame and held in place 
by nailing the diagonals to the frame above the cloth. A gallon of 
linseed oil is sufficient for rendering four covers of the size above 
specified sufficiently air-tight for this method. 
The number of frames for use depends upon the degree of infesta- 
tion and the rapidity of the operators. Ordinarily about 10 frames 
are sufficient for one man’s attention. 
Method of application.—The frame is placed over the infested plant. 
One sheet of the fumigating preparation is torn into from two to four 
or more equal parts (according to directions on the package or as 
experience may decide) and each part is put in a tin fruit can under 
the frame near a corner and then ignited. The cans are perforated 
at the bottom by driving a large nail in at the side. It is well to usea 
long taper or fuse for lighting the fumigant, affording the more active 
beneficial insects time to escape from under the cover before the tobacco 
fumes are given off. Earth is then heaped on the border of the cloth 
on the ground to prevent the escape of the smoke. The frame should 
remain in position ten or fifteen minutes, or longer if preferred. Each 
operator should have enough frames to handle so that each frame in 
succession may remain on a Vine during the time mentioned. | 
In localities where the aphis is most injurious local merchants who 
deal in insecticides should be informed of the fact and requested to 
keep a supply of fumigating preparation always in stock. 
The best time for fumigating is when there is no wind and the vines 
are damp. In moderately dry weather, however, good results may 
be obtained. f 
Caution. —Care should be exercised not to allow the dry fumigant 
to ignite. It should smolder only. Vines should not be disarranged 
except where they protrude a few inches beneath the cover. The 
leaves should not touch the top of the cover. 
Variations of the fumigating frame.—The frame described above 
has been used in the fumigation of young plants in southern Texas. 
The size and make-up of the frames may be altered or improved by the 
individual grower to adapt them to the size of the vines and the nature 
of the plant to be fumigated. Farther north than Texas manifestation 
of injury is not usually observable until the plants have made consid- 
erably larger growth, and a larger frame, say about a foot high, will 
be found more desirable for general use. Unbleached cotton of com- 
pact mesh, at 10 cents a yard, answered as well as the oiled ** muslin” 
in experiments conducted by the writer, and there is a saving of time 
in its use. Moreover, it does not collect dirt nor soil the clothing and 
other objects with which it comes in contact. 
For the treatment of plants other than cucurbits, such as cabbage 
affected by the cabbage aphis, eggplant, tomatoes, and other truck 
Mr. Sanborn advises a hood, using a frame made of two wires bent in 
a semicircle. Strong barrel hoops may be substituted, and the cover 
tacked to them at the top where they cross and at the bottom of the 
