New YorK AGRICULTURAL EXPRPRIMENT STATION. BS 
could be banked directly against the fumigator, making as close 
a joint as when placed upon thé sod-cloth. As the latter proved 
to be very much in the way when moving the fumigator it was 
removed. 
Cost.—The cost of building a twelve-foot fumigator, not in- 
cluding labor of putting on cover and oiling of same was $27, 
while the cost of the smaller size was $22.37; hence the entire 
cost of building such fumigators ought not to exceed $30 and 
$25 respectively. 
Manipulation—The method of using and handling the folding 
fumigator after treating a tree was as follows: First, the front 
lid of top was unhooked and turned back, the doors were opened 
next and the front brace removed. By having the open-bar 
staples placed at the proper height the poles used for carrying 
the fumigator rested upon the workmen’s shoulders, allowing 
them one hand free for lifting branches or holding the doors 
open. See Plate XVIII. After placing the fumigator around a 
tree the charge of cyanide was placed in its receptacle, the 
generator being placed beneath the latter; next, the brace was 
replaced, the doors brought together, the lid closed and hooked, 
after which the doors were hooked and base of fumigator 
banked. See Plates XIX, XX and XXI. 
A light pole for unfastening hooks and opening lid proved use- 
ful. With the aid of an anchor rope the same pole proved 
handy for closing the lid especially on the twelve-foot fumiga- 
tors. 
Whenever the wind was not too brisk and a fumigator had to 
be moved but a short distance it was found unnecessary to use 
the front brace. By the use of all braces and the addition of 
anchor ropes the folding fumigators could be used on days when 
the wind was too heavy for handling tents; they could also be 
anchored and left standing in an orchard over night. 
With a set of four folding fumigators and five men, forty trees 
could be fumigated in a day. In no case was the time of ex- 
posure less than thirty minutes and in most cases it exceeded 
forty-five minutes. With the four fumigators there were 
