312. Report oF THE DEPARTMENT oF ENTOMOLOGY OF THE 
closely than the “ Lockwood;” as a result it required less oil in 
filling. 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 beeswax 4 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 holders —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. 8, 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. | 
Attachments.—F or 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 eye 
screws went through the cover, and leather mes 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 
