220 FUMIGATION METHODS 
tent quickly raised and dropped over an adjacent tree. 
It is quite important to have the pole on the windward 
side of the tent. 
The trees were fumigated April 19, 20 and 21, 
using one ounce of potassium cyanide to 75, 100 and 150 
cubic feet of space respectively. The trees fumigated 
were peach and pear, several varieties, and the buds 
were beginning to swell. The outcome of the tests 
showed clearly that the scale was all killed, even on 
trees where the gas was used at the rate of one ounce 
of cyanide per 150 cubic feet of space enclosed. 
