Further Tests of the More Promising Materials Against the Body Louse1

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Abstract
Approx. 7,500 compounds were tested from Apr., 1942, through Oct., 1945, to determine their knock-down effect on the body louse, Pediculus humanus corporis. The materials were tested at a conc. of 1% in acetone or some other suitable solvent. Circular woolen cloth pads were dipped into these solns., allowed to dry for 1-2 hrs., and then placed in 50-ml. beakers together with 10 young adult lice. During the tests the lice were held at 86[degree]F (30[degree]C) and approx. 75% rel. humidity. Examinations were made after 15 and 30 min., and after 1 hr. Of the compounds tested, 29 gave knock-down of lice in 15 min., 29 in 30 min., 120 in 1 hr. The lasting properties, the ovicidal properties, and certain other characteristics of some of the better materials are also discussed.

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