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      Knowledge is Power

      Scientific American June 23, 1917

      Polarized Light in Vegetable Histology

      Some Investigations of Plant Tissues

      • By C. W. Ballard on June 23, 1917

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      More in the June 23, 1917 issue of Scientific American
      • Chemical Changes Produced by the Addition of Lime-Water to Milk
      • Selenium and the Optophone
      • The Planetary Origin of Water
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