Harvard Alumni Bulletin Volume 16
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Harvard Alumni Bulletin Volume 16

Harvard Alumni Bulletin Volume 16


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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. 1913 Excerpt: ...If that relation is changed, that is, if the angle at which the rays of the sun fall upon the leaf is varied, the capacity of the leaf for normal work is at once affected. The food supply of the tree will diminish yearly and in time the constitution of the tree becomes so weak that it is captured without resistance by the first attack of an insect enemy. Now let us apply the foregoing principles to the elms in the Yard. For the better part of a century these elms were surrounded by one and two story buildings or by open spaces. Then tall buildings, of four and five stories, began to go up, and this continuing movement in a few years changed radically the former environment of these elms. The leaves could not receive their accustomed light and therefore failed in the performance of their duties. The trees in the mean time with lessened ammunition or failing guns had to stand on the firing line against a closely entrenched enemy. In the unequal contest our fraternal and noble elms continued to fight until they fell in their tracks, the last blow being delivered by the leopard moth! Of course I do not wish to be understood as belittling the value of the root function of a tree. The roots also had unfriencjly deeds done to them. Yearly they were deprtved of the fallen branches, twigs and leaves which restored largely the mineral abstracted from the soil during the active period of the tree. Again, the sidewalks, pavements, hard paths and compact lawns kept the proper amount of air and moisture from the soil, thus weakening the function of the root. If the above outline is correct as to the processes of the growth and life of a tree, it follows that young elms could be used to replace the old ones. For under conditions that killed the old trees, young trees begi...


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Product Details
  • ISBN-13: 9781130774092
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 358
  • Spine Width: 19 mm
  • Width: 189 mm
  • ISBN-10: 1130774090
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 640 gr

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