Forest Influences

Forest Influences

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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. 1893 edition. Excerpt: all shades of opinion, from those absurdly favorable to trees to those utterly adverse. Direct comparison of observations is here not possible, or at least comparable observations have not been carried on, and, as in the case of temperatures over wooded and treeless districts, there is always occasion for doubt whether the differences found at the selected different stations are. not due to other things than the presence or absence of forests. The difficulty is, in fact, greater here than in the case of temperatures, because the rainfall is especially sensitive to all sorts of conditions and surroundings, and is also apparently very capricious (changing from month to month or year to year by large amounts and without any discoverable cause). In addition to all this, when a difference of rainfall corresponding to a difference of forest conditions has been fouud, there is still occasion for doubt as to which is cause and which effect. There is every reason to believe that with increased rainfall, other things being favorable, there will be an increased growth of trees. The facts at hand do not prove, with entire conviction, that forests increase the rainfall. The historical method is lacking generally in the character of the data for the beginning of the comparison. Besides, where a change of rainfall is actually shown to be coincident with a change in the forest growth it is not entirely certain that the former is due to the latter; it may be due to what are called secular changes of the rainfall, the reasons for which lie beyond our knowledge. The geographical method is not entirely satisfactory, for the reasons already mentioned. The entirely convincing method depends on observations above forests and with systems of radial more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236902874
  • 9781236902870