The Monthly Review. New and Improved Ser. New and Improved Ser

The Monthly Review. New and Improved Ser. New and Improved Ser

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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. 1833 edition. Excerpt: ...differs from the commonly received opinion, that the sap rises through specific vessels. He conceives, on the contrary, that it penetrates into and diffuses itself throughout every part of the plant, passing in greatest quantity where it finds readiest admittance and most room; such, for instance, as the intervening spaces between the different orders of vessels which compose the stem, and especially the intercellular interstices. It is objected to this hypothesis, that nature must doubtless have provided appropriate vessels for the conveyance of a fluid which performs so important a part in vegetation, and would never suffer this fluid to wander in uncertainty through the casual interstices it might meet with; But, on the other hand, we must remember that the important functions of this fluid commence only after its elaboration in the leaves, and that nature has reserved specific vessels for its preservation in this improved state. The great desideratum in the vegetable economy is, that the ascending sap should be abundant, and be diffused throughout the plant; the wisest provision, therefore, that could be made for these purposes is, that it should penetrate into every part as water penetrates into a sponge. The absence of the sap is, however, not owing to this hygroscopic power. It is attributed, by M. De Candolle, to a vital principle of the plant, which he denominates excitability. By the agency of this principle, the cellular tissue alternately dilating and contracting, propels the sap upwards: the hygroscopic property seems to act as a subordinate agent, and serves merely to promote the general diffusion of that fluid. acide carbonique; elle perd par l'exhalaison une tres grande partie de l'eau qu'elle contient, et, par la...
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Product details

  • Paperback | 328 pages
  • 189 x 246 x 18mm | 585g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236624343
  • 9781236624345