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On Parthenogenesis, a Discourse Introductory to the Hunterian Lects. on Generation and Development, 1849

On Parthenogenesis, a Discourse Introductory to the Hunterian Lects. on Generation and Development, 1849


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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.1849 Excerpt: ... There is doubtless a close and beautiful analogy between the stages of the development of the Medusae and those of the Tree; between the larva of the one and the leaf of the other, between the ovum of the animal and the seed of the plant. Yet this comparison does not explain the essential condition of gemmation in either: one thing unexplained cannot be made to illustrate another unknown thing. One seems to get some knowledge when it is stated that the leaf is produced ' by continuous growth, ' and that the bud of the Hydra is produced like the leaf. And had the reviewer recognized the essential concordance between the 'continuous growth' of the conferval filament and that which augments the germinal mass in the ovum, he might have arrived at the desired explanation; but he affirms them to be 'altogether distinct.' Admitting the obvious analogies between the reproductive phaenomena of the Medusa and the Plant, Dr. Carpenter says, "the whole of these phaenomena appear to us to constitute but a single generation, instead of making two, as represented by Steenstrup;" and, availing himself of the popular idea that a tree is one individual living thing, he turns those analogies with apparently great power against the definitions of Professor Steenstrup. It is quite true, as the able reviewer says, "that men are not in the habit of speaking of leaf-buds and the flowerbuds of a plant as of two distinct generations." But before the whole doctrine of the 'alternation of generations' is knocked to the ground (p. 205), those who desire to secure for the ingenious Danish Professor the credit which he really merits, may bring to his support that other and perhaps truer interpretation of the phaenomena and analogies arrayed against him, to which I have before referred in ...


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Product Details
  • ISBN-13: 9781235780738
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1235780732
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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On Parthenogenesis, a Discourse Introductory to the Hunterian Lects. on Generation and Development, 1849
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