The Popular Science Monthly Volume 39

The Popular Science Monthly Volume 39

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 edition. Excerpt: ...while he disputes the excessive claims that have been made for certain "weather plants," points out that a modest degree of power in forecastirg atmospheric changes is possessed by a multitude of common plants. The pleasant fair-weather odor of Oalium vernum (Our Lady's bed-straw) becomes strong and pungent at the approach of rain. The leaves of Carlina vulgaris close before rain. Calendula pluvialis (marigold) predicts rain when its flowers remain closed after seven in the morning. Oxalis aeetosella (wood-sorrel) closes its leaves at the approach of rain or cold. Lapsana communis keeps its flowers open at evening if it is to rain the following day, but closes them if fair weather is coming. The leaves of Draha verna (whitlowgrass) droop before rain. Alsine media predicts a clear day if its flowers open about nine o'clock, and a second one to follow if they remain open as late as four in the afternoon. A Novel Ifonnd-bnilders' Strnctnre.--Prof. F. W. Putnam described, at the meeting of the American Association, a curious earthwork at Foster's Station, in the Little Miami Valley. The mound is in the angle of a creek and the river. It is a flat-topped circular hill, about half a mile round at the rim, and has been formed by the river and creek washing away drift material on cither side. Around the brow of this hill is, at some parts, a ridge, at others no elevation above the surface. The ridge is made up of well-burned clay, and includes masses of burned limestone, clinkers, charred logs, and heaps of ashes, from a bushel to forty bushels in bulk. It is more than half a mile long, from twenty to fifty feet wide, and from eight to ten feet deep. To have burned all this clay must have required a heat like that of a Bessemer furnace....
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Product details

  • Paperback
  • 189 x 246 x 22mm | 744g
  • United States
  • English
  • black & white illustrations
  • 123691998X
  • 9781236919984