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      Celebrate Math Awareness Month

      Scientific American September 20, 1879

      Morbid Fear as a Symptom of Nervous Disease *

      • By George M. Beard

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      More in the September 20, 1879 issue of Scientific American
      • A Mirror Barometer
      • Influence of Electricity on Colliding Water Drops
      • On A New Violet Coloring Matter
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