Organic Compounds Tested Against Body Louse Eggs1

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Abstract
From 1942 through 1945 several thousand compounds were tested against the eggs of Pediculus humanus corporis. Most of the tests were made by dipping small pieces of cloth bearing 100 to 200 or more 4- to 6-day-old eggs into alcoholic solns. of the test materials, allowing the eggs to dry in the open air for about an hour, and then incubating at 30 C. The relative humidity was held at approx. 85%. Materials are listed that caused 100% mortality of eggs when used at a strength of 1% or less. Of the 312 materials listed, 215 were not lethal at 0.5%. Complete mortality was obtained with 20 compounds at 0.25%, but only 2 of these, chloromethyl p-chlorophenyl sulfone and sebaconitrile, proved completely lethal to eggs at 0.1%. The 20 compounds that caused complete mortality as 0.25% alcoholic solns. were also tested as powders in pyrophyllite. All materials proved far less effective in pyrophyllite than in alcohol.

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