312 Keport of the Department of Entomology of the 



closely than the "Lockwood;" as a result it required less oil in 

 filliug. Undoubtedly a grade of sheeting known as " Utica " 

 costing 20^c per yard for nine-quarter goods would have been 

 better than " Palma " but this would have made the fumigator 

 nearly as heavy as if covered with duck. 



Filler. — After fastening cover to frame it was painted with 

 the following mixture: Raw linseed oil 5 gal., lampblack, 

 ground in oil, 1 lb., melted beeswa:x ^ lb. Two coats of filler 

 were required on Palma and three on Lockwood. 



To make all joints air-tight the edge of each door and the 

 groove of the top-frame were lined with double faced Canton 

 flannel. To avoid glazing, the Canton flannel should be put on 

 after oiling. Felt was tested for the above purpose but cost 

 more, was not as easily fitted, did not stay in place as well, nor 

 wear as long as Canton flannel. 



Cyanide Jiolders. — On the rear cross brace of each fumigator a 

 cigar-box with one end removed was rigged for holding the 

 charge of potassium cyanide. See c. Fig. 3, Plate XXIV. A 

 string passing through a very small hole in one of the rear verti 

 cal rails was attached to the box in such a manner that when 

 released the contents were dumped into the generator. 

 Earthenware stew-kettles holding from one to two gallons were 

 used as generators. 



Attacliments. — For handling a fumigator four open-bar staples 

 were used, one being attached to each side corner. These were 

 put on with stove bolts and were easily removed when fumigator 

 was folded. By placing sixteen-foot scantlings under the 

 staples, four men, with a little practice, could easily move a 

 10 X 12 foot fumigator. See Plate XVIII. 



Large leather washers were used where all hook and eve 

 screws went through the cover, and leather facings were used 

 under the staples. 



At first a sod-cloth or flap was attached around base of fumi- 

 gator for banking upon in same manner as with tents. This 

 proved to be of slight advantage except on very windy days 

 when there was danger of the fumigator jumping. The soil 



