290 RepPorRT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
IV. A MODIFICATON OF THE STATION FUMIGATOR. 
A simple method of fastening the door of the tree fumigator 
described in Bulletin 181 of this Station has been suggested and 
found to give so much better satisfaction than the old one that 
it is considered worthy of special men- 
tion. 
The improvement does away with the 
buttons. In their places stout strips 
are used which extend across the door 
to the margin of the fumigator as 
Shown in Plates XIII and XIV. These 
Strips are of hard wood, two inches 
wide and three-fourths of an inch thick. 
The projecting ends are cut on an angle 
to fit against corresponding surfaces of 
the blocks fastened to the door casing 
as at a, Fig. 1. The blocks are of the 
shape shown at 6. When the strips 
and blocks are in place and the door is 
being forced into position the down- 
ward pressure brings it against the 
supporting sides, top and bottom of the 
fumigator. 
With these fastenings the door should 
extend to the top of the fumigator in- 
stead of within two or three inches of 
the top as when the buttons are used. 
This is to permit it to slip in place 
easily. The strip across the top against 
which the top of the door rests should 

Fic, 1.—Fumicator Door 
Fastener. A, Ewnp oF STRIP 
ATTACHED To Door; B, Brock 
Bo.tep to Door Casino. 
be at least three inches wide and the corresponding strip of the 
door the same width. Both should be covered with heavy felt 
as described in Bulletin 181. 
Both strips and blocks should be made of hard wood and 
should be bolted on securely. It is of especial importance also 
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