New York Agricultural Experiment Station. 307 



KCN. Whether the additional expense required will warrant 

 the use of this amount should be decided by the operator, and 

 in many cases he can even decide from the condition of the 

 trees whether it is necessary to use a heavy charge. 



APPAEATUS. 



TENTS. 



During 1899-1900 two sizes of sheet tents were made and 

 tested for orchard fumigation. Two twenty-foot and two thirty- 

 foot tents were constructed at a cost of |15 and Sf>25 apiece for 

 the two sizes, by the Richard Fitzgerald Water Proof Co., 38 

 South street, New York city, on the following plan: Each tent 

 was octagonal in shai^e, the seams all running to a comniou 

 centre, which was strengthened by sewing on an extra piece 

 six feet square. A quarter-inch rope was hemmed in to reen- 

 force the bottom. 



After making, the tents were dipped in a mixture of linseed 

 oil and lampblack combined with some substance that kept 

 them pliable when dry. One large tent was of heavy drill, the 

 other large tent and the two small tents were made of sheeting. 



To protect the trees from injury by the tents and at same time 

 to prevent tearing the tents with broken branches, U shaped 

 bows were made of iron pipe and used over the trees. It was 

 thought these bows would not only protect the trees but be an 

 aid in sliding the tent on and off the tree, as well as give a uni- 

 form size and shape to the enclosed space. Three sizes of the 

 piping were tested, viz., one-fourth, three-eighth and one-half 

 inch. The first proved worthless, the three-eighths answered 

 for the small tents, while the one-half inch answered for all 

 purposes. Three of these bows were required over each tree, 

 and in order to manipulate four tents to advantage, six sets of 

 three each were necessary. The additional cost of the bows 

 brought the cost of the outfit to |26 and |39 each, for small 

 and large tents, respectively. 



A method of manipulating the tents and the arrangement of 

 the bows or arches are shown in Plate XVII. With a little care 



