28 FUMIGATION METHODS 
nection with the Morse fumigator, is shown in Fig. 11. 
All the earlier forms of fumigators were provided 
with generators and blowers. ‘They have all been 
superseded by different forms of tents better adapted 
for orchard work. 
To meet the general conditions in the East and 
other places, I have perfected still another form, which 
has been called the Emory fumigator, and is shown 
in Figs. 32 to 35. On large orchard trees the sheet 
tents are better adapted for general work than the box 
tents. The Emory fumigator is especially adapted for 
trees under ten feet in hight. 
The canvas or sheet tent.—The octagonal form 
known as the sheet tent has been used largely in 
California and by the United States Department of 
Agriculture. The size of these tents depends upon 
the size of the trees to be fumigated. Sheets from 
twenty-five to forty feet and over in diameter are in 
common use. One tent used in my experiments was 
forty-five feet in diameter and was used only on large 
trees. Another canvas tent, made in several sections 
with a square top and base, designed by R. S. Emory, 
is shownin Fig. 12. ‘These tents vary in size to meet 
the requirements under different conditions in various 
orchards. A very convenient size of canvas-box tent 
is fifteen feet square at the bottom, ten feet square at 
the top, and fifteen feet high. Occasionally tents of 
this same design of much smaller dimensions are used, 
but they are not generally recommended. 
Construction of tent.—All tents now in general use 
are usually made of eight-ounce cotton duck, such as 
