Science: Deadlier Insecticide

Ever since DDT came out of the laboratory two years ago, chemists have been trying to improve on the "wonder killer." Last week a Britisher announced his entry: "Activated DDT," a concoction of pyrethrum and DDT.*

The inventor, Cambridge Chemist Harry Hurst, 34, claimed that he had got rid of the defects in DDT (see below). DDT is 1) slow, and 2) deadly to good as well as bad insects. Dr. Hurst said that some of his mixtures seem to be highly selective, attacking pests but leaving useful insects unharmed. He had also found...

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