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      Knowledge is Power

      Scientific American July 15, 1893

      The “Sap” of Trees and its Movements

      • By Charles R. Barnes on July 15, 1893

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      More in the July 15, 1893 issue of Scientific American
      • A Portrait of Columbus Attributed to Titian
      • Hargrave's Flying Machine
      • Oils of Apricots, Cherries, Plums and Peaches as Adulterants of Almond Oil
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