290 Report of the Department of Entomology of the 



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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 furaigator 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 

 be at least three inches wide and the corresponding strip of Ihe 

 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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Fio. I. — FuMiOATO* Door 

 Fastener. A, End of Stri? 

 Attached TO Door; B, Block 

 Bolted to Door Casino. 



