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The Use of Hydrocyanic Acid Gas for
Exterminating Household Insects

Recent successful applications of hydrocyanic acid gas for the extermination of insects infecting green-house plants
have suggested the use of the same remedy for household pests. It is now an established fact that 1½ grains of 98
per cent pure cyanide of potassium volatilized in a cubic foot of space, will, if allowed to remain for a period of
 not less then 3 hours, kill all roaches and similar insects.