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Educational Review Volume 25

Educational Review Volume 25


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...of seeds--An attempt is made to form some idea of the rate at which plants might multiply, as indicated by the seed production. 1. Near the schoolhouse a vacant city block rather thickly covered with wild verbenas was selected for study. 2. By measurement and calculation this area was found to contain approximately one-fourth of an acre. 3. Areas of one square yard each were measured in various places, and the average number of plants was calculated. 4. An average of thirty plants per square yard gave approximately 36,00x3 to the quarter acre. 5. Each seed pod contained four seeds, one of which, on the average, it was found, failed to mature. The number of pods on a spike was counted, which when multiplied by the number of spikes, gave 2300 seeds as the average number produced by each plant. Since only three-fourths of the total number matured, each plant furnished, therefore, approximately 1700 good seeds available for growth. 6. If these good seeds were properly distributed, and if each were to produce a plant, the one-fourth of an acre the second season could populate 425 acres--approximately two-thirds of a square mile, i. e., equal to an area bounded by Cottage Grove Avenue and State Street on the east and west, and Sixty-third and Fifty-fifth streets on the north and south. The third season, under the same suppositions, enough seeds would be furnished to populate 1122 square miles, i. e., more than six times the area of Chicago. The fourth season, under the same suppositions, the area populated would be 1,907,400 square miles, i. e., equal to about thirty-four times the area of Illinois. The fifth year the number of seeds would be sufficient to furnish plants as thickly as those found on the quarter of an acre equal to sixteen times that of...


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Product Details
  • ISBN-13: 9781153886055
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 184
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1153886057
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 390 gr


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