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      Knowledge is Power

      Scientific American November 21, 1885

      Microscopic Examination of Ciliated Organisms by Intermittent Light

      • By George M. Hopkins on November 21, 1885

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      More in the November 21, 1885 issue of Scientific American
      • Correspondence - November 21, 1885
      • Hair Cutting Machine
      • Purifying and Separating Middlings
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