New YorK AGRICULTURAL EXPERIMENT STATION. 307 
KON. 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. 
APPARATUS. 
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 $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 shape, the seams all running to a common 
centre, which was strengthened by sewing on an extra piece 
six feet square. A quarter-inch rope was hemmed in to reén- 
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 
