GREENHOUSE AND COLD FRAME FUMIGATION 139 
The insects present were green fly, mealy bug, and 
Fuller’s leaf beetle. The plants were coleus, azaleas 
in bloom, heliotrope, ferns, hoya, jasmins, polygala, 
hibiscus, ericas, orange trees, camellias, cinerarias, and 
oxalis. The temperature went below 50° F. No 
plants were injured. Part of the green flies were 
killed, but mealy bug and leaf beetle were not injured. 
Another trial was made in the camellia-room just 
mentioned a few days later with gas generated from 
one ounce cyanide to 2,000 cubic feet of space. The 
exposure was continued throughout the night. No 
plants were injured. The green flies were all killed, 
but only a few of the mealy bugs were destroyed. 
A few days later another test was made in the same 
room, using one ounce cyanide for each 1,000 cubic 
feet. ‘The temperature of the room was slightly above 
50° F. With the exception of heliotrope and coleus, 
the plants were the same as used in the two previous 
tests. All the mealy bugs were destroyed. It would 
seem from these tests that the gas can be used in a 
greenhouse, under such conditions, generated from one 
ounce cyanide in 1,000 cubic feet of space, with good 
results upon the common mealy bug. 
Many other tests were made, including the vege- 
table house. The cyanide was used at the rate of one 
ounce for each 3,000 cubic feet of space enclosed. The 
temperature was about 56° F. The plants fumigated 
were lettuce, radishes, papyrus, smilax, cinerarias, and 
kale. The lettuce and cinerarias were badly covered 
with green fly. Nearly all green fly was killed, even 
under the lower leaves of the lettuce which had com- 
menced to head. There was no injury to plants. 
