File:Heredity and sex (1913) (14593779340).jpg

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Description
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Identifier: hereditysex1913morg (find matches)
Title: Heredity and sex
Year: 1913 (1910s)
Authors: Morgan, Thomas Hunt, 1866-1945
Subjects: Heredity Sex Heredity
Publisher: New York, Columbia University Press
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 11. — Octopus, male showing hectocotyl arm (Jia). Cop-ulation (below), small male, A; large female, B. After separation the female deposits her strings ofeggs, which are fertilized by the sperm escaping fromthe spermatophores. In octopus and its allies, onearm, that is used to transfer the spermatophores, isspecially modified at the breeding season (Fig. 11). 26 HEREDITY AND SEX This arm is inserted by the male, as shown in the figure,within the mantle chamber of the female. In somespecies, Argonaut a argo for instance (Fig. 12), the arm
Text Appearing After Image:
Fig. 12. — Argonauta showing developing (A) and developed (B)hectocotyl arm, which, after being charged with spermatophores, is left inmantle of female. is broken off, and remains attached by its suckers in-side the mantle of the female. The eggs are later fer-tilized by sperm set free from this ^hectocotylized arm. THE SECONDARY SEXUAL CHARACTERS In the most highly evolved stages in the evolutionof sex a new kind of character makes its appearance.This is the secondary sexual character. In most casessuch characters are more elaborate in the male, butoccasionally in the female. They are the most aston-ishing thing that nature has done: brilliant colors,plumes, combs, wattles, and spurs, scent glands (pleas-ant and unpleasant); red spots, yellow spots, greenspots, topknots and tails, horns, lanterns for the dark,songs, bowlings, dances and tourneys — a medley ofodds and ends. The most familiar examples of these characters arefound in vertebrates and insects, while in lower forms THE

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Flickr tags
InfoField
  • bookid:hereditysex1913morg
  • bookyear:1913
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Morgan__Thomas_Hunt__1866_1945
  • booksubject:Heredity
  • booksubject:Sex
  • bookpublisher:New_York__Columbia_University_Press
  • bookcontributor:Francis_A__Countway_Library_of_Medicine
  • booksponsor:Open_Knowledge_Commons_and_Harvard_Medical_School
  • bookleafnumber:40
  • bookcollection:medicalheritagelibrary
  • bookcollection:francisacountwaylibrary
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
29 July 2014

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