IIo FUMIGATION METHODS 
those shown in Figs. 64 and 65 will serve as examples. 
Figure 64 is a view of a double house. It has two 
separate compartments. While a load of trees is being 
fumigated in one compartment, ventilation is taking 
place in the other. It has two thicknesses of lumber, 
one matched, tongue and grooved, the other either the 
FIG. 65—CANADIAN FUMIGATING HOUSE AT THE ONTARIO 
AGRICULTURAL COLLEGE 
same or cover-siding well-matched, and two thicknesses. 
of paper between. The doors are the same and padded 
all around. 
Figure 65 shows the fumigation house at the Agri- 
cultural College at Guelph, Canada. It is substan- 
tially built, dressed lumber being used in its construc- 
tion. Its size is 10x 8x 7% feet. It contains 600 
cubic feet. The frame, of 2x 4 inch scantling, has two 
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