File:The descent of man, and selection in relation to sex (1874) (20867464905).jpg

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Title: The descent of man, and selection in relation to sex
Identifier: descentofmansele1874darw (find matches)
Year: 1874 (1870s)
Authors: Darwin, Charles, 1809-1882
Subjects: Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences
Publisher: New York : A. L. Burt
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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Text Appearing Before Image:
FISHES. 383 while young resemble tlie adult femav.^ in color and struct- ure. Sexual differences such as these may be strictly com- pared with those which are so frequ^t with gallinaceous birds.* In a siluroid fish, inhabiting the fresh waters of South America, the Plecostoimis harhatus\ (fig. 31), the male has its mouth and inter-operculum fringed with a beard of stiff liairs, of which the female shows hardly a trace. These
Text Appearing After Image:
Fig. 80. Xiphophorus HeUerii. Upper figure, male; lower figure, female. I lairs are of the nature of scales. In another species of the game genus, soft flexible tentacles project from the front fpart of the head of the male, which are absent in the emale. These tentacles are prolongations of the true skin, and therefore are not homologous with the stiff hairs of the former species; but it can hardly be doubted that both rve the same purpose. What this purpose may be it ie ifficuh to conjecture; ornament does not here seem prob- able, but we can hardly suppose that stiff hairs and flexible *Dr. Giintlier makes tliis reaiark; firitish Museum," vol. iii, 1861, p. 141, Catalogue of Fishes in the t See Dr. Giinther op this grenus, in ** Proc. Zoolog. See./* 1968, p.

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Flickr tags
InfoField
  • bookid:descentofmansele1874darw
  • bookyear:1874
  • bookdecade:1870
  • bookcentury:1800
  • bookauthor:Darwin_Charles_1809_1882
  • booksubject:Evolution
  • booksubject:Natural_selection
  • booksubject:Heredity
  • booksubject:Human_beings
  • booksubject:Sexual_selection_in_animals
  • booksubject:Sexual_dimorphism_Animals_
  • booksubject:Sex_differences
  • bookpublisher:New_York_A_L_Burt
  • bookcontributor:Harold_B_Lee_Library
  • booksponsor:Brigham_Young_University
  • bookleafnumber:423
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
25 August 2015

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