34 COCKROACHES. 
three pounds of sulphur and three ounces of saltpetre per 1000 cubic 
feet of air space. All doors, windows, and other openings should be 
tightly closed before the sulphur and saltpetre are ignited. . . 
Chlorine fumes may be used with equal benefit where burning sulphur 
may create an added element of danger from fire. . . . To prepare 
chlorine fumes: mix in a glazed dish and place on a stove or other 
heating surface, peroxide of manganese, one part; sulphuric acid, two; 
chloride of sodium, three; water, two; or more easily by mixing three 
pounds of chloride of lime and three pounds of hydrochloric acid for 
every 1000 cubic feet of space.’’ * 
The above recipes were recommended as remedial applications for 
destruction of the very destructive (and difficult to destroy) mill pest, 
the Mediterranean Flour Moth, and may be confidently expected to be 
of use in all cases of fumigation. But perhaps it may be but right 
to suggest to house-owners, and those who may need to use these 
remedies on the small scale of kitchen use, that it is very desirable 
they should only be used by trustworthy hands; and also, as it is 
perfectly incredible to what lengths stupidity or misunderstanding 
may sometimes be carried, that they should very carefully see that the 
operator does not shut him- or her-self up as a preliminary, with 
possibly most serious consequences. 
But whether for our common kind or the little German Cockroach, 
it cannot be too clearly borne in mind that drowning or any moderate 
stupifying of the pests is probably time and money thrown away, unless 
the apparently dead bodies are burned, or in some way or other quite surely 
destroyed. 
* See Bulletin 1, Provincial Board of Health of Ontario, ‘‘The Flour Moth, 
Ephestia kuhniella,’’ issued by the Ontario Department of Agriculture, 1889, 
pp. 12 and 14. 
