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      Scientific American September 27, 1890

      The Toxic Principle of Pyrethrum Flowers

      • By Schlagdenhauffen, Reeb on September 27, 1890

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      More in the September 27, 1890 issue of Scientific American
      • Electric Sharpening of Files
      • Sketches in Bradford, England
      • The Thies Process of Barrel Chlorination
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