28 FUMIGATION METHODS 



nection with the Morse f umigator, is shown in Fig. 1 1 . 

 All the earlier forms q 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 superseded by different forms of tents better adapted 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 Kmory 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 shown in 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 



