54 FUMIGATION METHODS 



and the tent is a little slack a few pieces of stone or 

 chunks of wood may be required to hold it down. 



When the trees are uniform in size as many rows 

 are taken as there are tents in use. The sheet tents 

 are then transferred from tree to tree by simply revers- 

 ing them over and over again. The method varies 

 from the foregoing only in the fact that the pulley 

 rope is carried around the side opposite the lifter and 

 fastened to the bottom of the tent covering the trees. 

 The lifter is also set at a more acute angle. The can- 

 vas tents with square tops, however, can not be re- 

 versed in this manner. In such cases they are taken 

 from the tree, lowered, and again hoisted in the usual 

 manner. The method of untenting a tree in an Eastern 

 orchard is shown in Fig. 25. On very large trees two 

 lifters are usually necessary, and in this manner the 

 weight of the tent can be kept almost entirely from 

 the branches. 



California outfit. In addition to the descriptions 

 of the apparatus already given from California, Figs. 

 26-29 will b e f interest. These photographs were 

 furnished by R. B. Cundiff, chairman of Riverside 

 County Board of Horticultural Commissioners, and 

 were taken for the United States Department of Agri- 

 culture for the Year-Book of 1900. It will be seen 

 by the figures that these tents are of enormous size 

 and are handled by two lifters, one on each side of the 

 tree, Figs. 26 and 30. The tent is pulled into position 

 very much in the same manner as already described. 

 After the tree is covered, as shown in Figs. 27 and 31, 

 the canvas is folded around the base and the gas is 

 generated. A novel feature of the outfit used in the 



