In a recent patent, Eagleson (1) described the use of sesame oil as a "synergist" or "activator" when combined with insecticides containing pyrethrins, rotenone, and the like. The addition of sesame oil reduces the concentration of the insecticide required to give 100% mortality of houseflies, and prolongs the paralysis or torpor of such insects as are not killed by the spray. For example, Eagleson found that a pyrethrum insecticide containing a 0.001 molar concentration of pyrethrins in refined kerosene, when sprayed on houseflies in the appara-TABLE I Effectiveness Against Houseflies of Various Fractions of Sesame Oil, Alone or As an Adjunct of Pyrethrum in Refined Kerosene (Two tests of about 150 flies each; concentration of pyrethrins 1 mg. and of sesame oil and its fractions 10 mg. per cc.

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