GRANARY WEEVILS. 109 
cheese vermin which shelter between the boards or other crannies in 
large cheese rooms. 
The use of the dressing machine or blower is also recommended to 
clear the infested grains. 
In regard to the application of heat as a disinfectant.—It is stated 
that Wheat can be subjected to a temperature of 150° without de- 
stroying its germinating power, and (without acting on this save with 
due experiment) it may prove that this would be a serviceable way of 
destroying the weevil maggots in the grain, which are very hard to 
reach by most methods of treatment. 
In regard to fumigation generally, or deterrents by means of strong 
vegetable or chemical scents, the utility of a large proportion is very 
doubtful.* Also some that in themselves are, or might be, useful as 
insecticides, as sulphur, for instance, or naphthaline, are of limited use, 
from their capability of injuring the nature of the flour, or imparting 
so strong a scent to the grain as to make it undesirable for food. 
The fumigant, of which the use has been steadily gaining ground 
both in the United States and in Canada for many years, is bisulphide 
of carbon. Of the method of application of this I have given notes in 
previous Annual Reports in extracts from the Bulletins or Reports 
of the Ontario Board of Agriculture; but the following extract from 
Mr. Chittenden’s pamphlet contains serviceable information, both as 
to the nature of the application, and likewise the great danger from its 
inflammability, and also the risk to health and even to life if carelessly 
used :— 
‘The bisulphide of carbon.—The simplest, most effective, and in- 
expensive remedy for all stored grain insects is the bisulphide of 
carbon. This is a colourless liquid with a strong disagreeable 
odour. It vaporizes abundantly at ordinary temperatures, is highly 
inflammable, and is a powerful poison. 
‘The most effective manner of applying the re-agent in moderately 
tight bins consists in simply pouring the liquid into shallow dishes or 
pans, or on bits of cotton waste, and distributing about on the surface 
* For a list of these, under the heading of ‘‘ Repellants, Counter-odorants, and 
Lure Traps,” see Mr. F. H. Chittenden’s pamphlet on ‘ The More Important Insects 
Injurious to Stored Grain,’ referred to in note, p.97. This pamphlet of about 
twenty pages is strongly to be recommended to all interested in insect grain attacks. 
It gives short accounts of about twelve grain or flour infestations, giving the most 
important points connected with them, and also figures of the greater number, and 
to these are added about four pages of remedies. It is in my opinion an excellently 
useful work, and where any intending purchaser should have difficulty in pro- 
curing it from his own bookseller, probably from the connection of Messrs. W. 
Wesley & Son, 28, Essex Street, Strand, London, E.C., with the special subject of 
supplying American agricultural publications they would have no difficulty in 
supplying it or procuring it. 
