GREENHOUSE AND COLD FRAME FUMIGATION 145 
Leave exposed twenty to thirty minutes, and no 
longer. Do the work on a dark, cloudy day, or late 
in the evening, or at night. Thoroughly air the 
frames afterward, and empty the residue in the jars. 
Do not inhale the gas, and do not handle the cyanide 
carelessly. Both are deadly poison if breathed or 
swallowed. 
General summary.—(1) The cubic contents of the 
house and the amount of cyanide to be used should be 
carefully determined. (2) The enclosure should be 
made as nearly gas-tight as possible. (3) The venti- 
lators should be arranged so as to be opened from the 
outside. (4) Place the screw-eyes in their proper 
places and run the string through them. (5) Deter- 
mine whether the bag of cyanide is direétly over the 
jar before the chemicals are placed init. (6) Measure 
the acid and water carefully, place it in the vessels, 
hang the bag of cyanide directly over them, and arrange 
the protection sheets of paper. (7) The bags should 
be lowered by loosening the string from the outside 
door. (8) Doors should be properly closed and left 
locked the desired length of time. (9) After proper 
exposure open the ventilators and doors from the out- 
side, and leave them thirty or forty minutes before 
entering the house. After that time they can be closed 
and left until morning. (10) The contents of the jars 
should be buried or thrown upon a manure pile. (11) 
Jars should be thoroughly washed with cold water and 
set away for future use. 
A practical application.—In reply to a recent letter, 
Edward A. Moseley, of Washington, D. C., says: ‘‘I 
most certainly believe cyanide ae is practical. 
