A Precise Method for Determining the Toxicity of Mixed Gases to Insects1

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Abstract
A precise method is described for determining the toxicity of mixtures of carbon dioxide and other gases to insects. The principle underlying the method is the introduction of the vapors of volatile fumigants into a partially evacuated fumigation flask, the amounts being measured by means of a mercury manometer. The fall of the mercury in the manometer is proportional to the concentration of the gases in the fumigation flask. Air is then allowed to flow in until the mixture within the flask is reduced to atmospheric pressure. The details of the method are given and the apparatus is figured. The literature on methods for the determination of the toxicity of fumigants to insects is discussed briefly.