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      Scientific American July 10, 1909

      Cocoons and how they are made

      Why Insects Spin Them

      • By S. Frank Aaron on July 10, 1909

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      More in the July 10, 1909 issue of Scientific American
      • Estimation of Nitrates and Nitrites in Water
      • New Photometric Units
      • The Duration of Life on the Earth
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