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      Knowledge is Power

      Scientific American August 14, 1886

      Willow Gentian or Swallow-Wort

      (Gentiana Asclepiadea.)

      • August 14, 1886

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      More in the August 14, 1886 issue of Scientific American
      • A Lecture Experiment for Showing the Composition by Volume of Nitrous and Nitric Oxides
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