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November 20, 1926


JAMA. 1926;87(21):1755. doi:10.1001/jama.1926.02680210061025

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Use of Hydrocyanic Acid for the Extermination of Rats  The council of the public health service of France has authorized the use of hydrocyanic acid for the extermination of rats in the holds of vessels. M. Violle, professor of hygiene at the University of Marseilles, describes the method employed. The procedure requires about three hours for a hold with a capacity of 1,000 cubic meters; namely, from ten to fifteen minutes for the discharge of the gas; one hour of contact, and two hours for the evacuation of the gas (or only one hour if suction pumps are used). The apparatus employed does not allow any gas to escape and emits no odor. Two grams of hydrocyanic acid is required for each cubic meter of space. No only the rats but also all vermin are exterminated. This method is now applied to the vessels arriving at Marseilles, in preference to

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