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The Descent of Man and Selection in Relation to Sex Volume 1, V. 2

The Descent of Man and Selection in Relation to Sex Volume 1, V. 2


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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. 1901 Excerpt: ...instances of this form of transmission--as in the case of the spurs, plumes, and brilliant colors acquired for battle or ornament by male birds, and inherited by the females in an imperfect or rudimentary condition. 88 This is the conclusion of Prof. Gegenbaur, one of the highest authorities in comparative anatomy; see "Grundziige der vergleich. Anat.," 1870, s. 876. The result has been arrived at chiefly from the study of the Amphibia; but it appears from the researches of Waldeyer (as quoted in "Journal of Anat. and Phys.," 1869, p. 161), that the sexual organs of even "the higher vertebrate are, in their early condition, hermaphrodite." Similar views have long been held by some authors, though until recently without a firm basis. al The male Thylaeinus offers the best instance. Owen, "Anatomy of Vertebrates," vol. iii. p. 771. 28 Hermaphroditism has been observed in several species of Serranus, as well as in some other fishes, where it is either normal and symmetrical or abnormal and unilateral. Dr. Zouteveen has given me references on this subject, more especially to a paper by Prof. Halbertsma, in the "Transact, of the Dutch Acad, of Sciences," vol. xvi. Dr. Giinther doubts the fact, but it has now been recorded by too many good observers to be any longer disputed. Dr. M. Lessona writes to me that he has verified the observations made by Cavolini on Serranus. Prof. Ercolani has recently shown ("Accad. delle Scienze," Bologna, Dec. 28, 1871) that eels are androgynous. The possession by male mammals of functionally imperfect mammary organs is, in some respects, especially curious. The Monotremata have the proper milk-secreting glands with orifices, but no nipples; and as these animals stand at t...


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Product Details
  • ISBN-13: 9781236390103
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 148
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1236390105
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 277 gr


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