Rules, Notes and Recipes 
187 
about % oz. of water to each 600 cubic feet of greenhouse space. Before 
fumigating, all the ventilators, doors and other apertures, large or 
small, in the greenhouse, should be closed, except the door by which 
the operator enters which, of course, should also be closed when he goes 
out; in short, the greenhouse should be made as nearly airtight as 
possible. It is well to arrange by a system of ropes and pulleys, or 
in some other way, so that the ventilators may be opened from the out- 
side after the period of fumigation is over. When everything is ready, 
the operator enters. He first pours the required quantity of water into 
each of the earthen vessels; next, he pours slowly into each the required 
quantity of acid and, lastly, he turns into each vessel, quickly, the 
required portion of cyanide from small paper bags into each of which 
the required portion of cyanide for each vessel has been placed, begin- 
ning the depositing of the cyanide from the paper bags into the earthen 
vessel which i.s far- 
thest away from the 
door. Get out of the 
greenhouse quickly 
after placing the 
cyanide into the ves- 
sels, since exposure 
to the gas, whicli will 
now be formed, would 
cause death in a few 
seconds; close and 
lock the door so that 
no one can enter. 
The gas should be 
used at night, in a 
dry greenhouse, 
which has not been 
watered that day, 
and when the night 
temperature is 65 
deg. or preferably 
less. The gas may 
be left in the greenhouse all night. No one should enter the 
greenhouse next morning until after the ventilators or doors, or both, 
have been open one-half hour or more. The formula given in this 
article is used by one of the very largest plant growers in this country, 
who says: “We have used the I’/i oz. 98 per cent, pure cyanide of 
potassium successfully on all of the plants we grow, including Roses, 
Carnations and bedding plants, with the exception of Asparagus plumo- 
sus. We would advise the user to experiment for himself where he 
wants to increase the 114 02 . amount.” We may add that this grower is 
a very large producer of ferns, pot Roses, Crotons, Dracaenas, Pandanus, 
Cyclamen, Hydrangeas, Azaleas, etc., and of bedding plants in large 
variety. This gas kills white fly, mealy bug, Ibrips, and various species 
of aphids in the greenhouse. 
Making Hotbeds. — Usually at about St. Patrick’s Day, JMarcb 17, 
liotbeds are made in the latitude of New York or Boston. A first essen- 
tial is a sufficient quantity of stable manure. This is kept in a heap 
