Experimental and Geological Memoirs

Experimental and Geological Memoirs

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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. 1867 edition. Excerpt: ...acid in some shape or other must be present in it. If any doubt exist on that head, I may refer in confirmation of it to the recent experiments of the Prince of SalmHorstmar e, which shew, that if the soil be deficient in any of the seven essential elements of plants, of which phosphoric acid is one, no complete development of its parts will take place. It would seem, therefore, at first sight, as if we had nothing else to do, except to observe whether or not a soil was utterly barren, in order to assure ourselves of the pre-. sence of this ingredient; and such undoubtedly would be the case, provided we could ascertain, that neither art nor nature had introduced any foreign body into the materials derived from the subjacent subsoil. But I know not how this can be confidently predicated, even with reference to a newly-peopled country, much less in the case of one long cultivated, like our own; since it would be necessary to prove, not only that the surface had never been modified by the addition of any kind of manure, but also that no torrent or flood had at any time spread over it materials derived from the country adjacent. It seemed to me, therefore, that it would be more satisfactory to try the experiment on a small scale, by bringing away from the spots, the subsoil of which it was my wish to test, a sufficient quantity of the pure rock to fill an open box, the dimensions of which should be about two feet square, and of nearly equal depth. Into this, the material, after having been coarsely pulverized, was introduced; more or less pure sand being added to it, according as this was found necessary, in order to bring the whole into that state of consistency, which appeared likely to render it, mechanically speaking, suitable for...show more

Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236808975
  • 9781236808974