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As the fluid is inflammable, and its vapor, mixed with air, some- 
what explosive, precaution should be taken never to permit a spark 
of fire to come in contact with it. 
Carbon bisulfid may be obtained at drug stores for 20 to 35 
cents a pound. A grade known as "Fuma Carbon Bisulphide," which 
is fully as effective for fumigation as the ordinary grade sold by 
druggists, is manufactured by E. R. Taylor, Penn Yan, New York, 
and furnished in 50- or 100-pound cans at 10 cents a pound. 
Sulphur 
Thoro cleaning of greenhouses for the eradication of insect pests 
should be practiced by the greenhouse gardener when the houses are 
empty, and fumigating with sulphur is one of the best and easiest 
means to this end. About one pound of sulphur should be burned 
to every 2,000 cubic feet of space, after which the house should be 
kept tightly closed for 24 hours, or longer if convenient. It is need- 
less to say that at this strength all plants, as well as insects, will be 
killed. 
For fumigating houses containing growing plants, evaporate a 
small quantity of sulphur in a suitable receptacle over a lamp or oil 
burner, taking care that it does not catch fire ; or the steam pipes may 
be painted with a sulphur paste made by mixing sulphur and water. 
A paste is sometimes made in which the sulphur is mixed with oil 
instead of water. Sulphur is not only valuable as an insecticide, but 
useful in controlling mildew. 
Tobacco Stems 
Tho tobacco stems for fumigation purposes have been largely 
superseded by the recent introduction of various nicotine extracts, 
they are still used, and are recommended for killing plant-lice and 
thrips, especially when easily obtainable at a reasonable price. 
Three piles of stems, of about half a bushel each, are used to every 
100 linear feet of the house, the piles being dampened to prevent 
rapid burning. These are set on fire in the evening, when the build- 
ing is left for the night. The house must be kept as tightly closed 
as possible until morning. Frequent fumigations — at least weekly — 
are necessary to obtain the best results. 
Nicotine Preparations 
Many nicotine preparations are now on the market under such 
trade names as "Nicoteen," "Nicoticide," "To-ba-ken," "Nico- 
Fume," etc. Most of them contain 25 to 45 percent of nicotine, and 
are more effective, tho more costly, than tobacco stems or tobacco 
dust. They may be used as fumigants in various ways. The com- 
