Science: Mosquito Killer

As a Los Angeles ratcatcher, W. Earl Duclus was a champion. He still claims the alltime record for rats trapped there in one day (1,072 in 1924). Now he is a mosquito slayer, and his exploits are fully as impressive. More than any other man, he is responsible for keeping sprawling Los Angeles comparatively free of the little bloodsuckers.

As field supervisor of mosquito control for the city health department, Pest-Hunter Duclus uses modern methods. All through the summer mosquito hunting season he and his men spray DDT into swamps, tidal flats, ponds and irrigation ditches. But Duclus says he owes much...

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