Chamber's Encyclopaedia; A Dictionary of Universal Knowledge for the People Volume 5

Chamber's Encyclopaedia; A Dictionary of Universal Knowledge for the People Volume 5

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 edition. Excerpt: ...generative organs and the horns; and the development of the latter ma be arrested, and their periodical sheddin may prevented by castration. As a genera rule, it is only in the male Cervida: that horns are developed. In the reindeer, however, they are common both to the male and female. In the hollow-horned ruminants, the bony protuberances or 'cores' arising from the frontal bones, and supporting the horns. instead of branchin like antlers, form more or less solid cylindrical siafts, the surface being protected by ordinary Pcriostenm (q. v.), and by an extension of true skin, which becomes deve oped into a dense horny sheath. In the accompanying figure, the horny sheath is detached from the right horn, so as to shew the 'core' in the interior. HORNY TISSUES were formerly regarded as extremely simple in their structure, and as being only different forms of a substance to which the term keratin (from keraa, a horn) was applied. Reccnt investigations, however, shew that the parts which consist of horny tissueas, for example, the persistent horns of the ruminants, the epidermis, the nails, claws, and hoofs, whalebone, tortoise-shell, &c.--have a somewhat complicated, and, in some respects, a variable structure, although they are so far analogous to one another that they roceed from nucleated cells which are not morp ologically developed like the cells of most other or ans, but which, to a certain extent, dry up am are only agglutinated together by an intercellular substance. In a chemical point of view, they also closely resemble one a.notl;er, for when compared with other tissues they all contain a large quantity of sulphur, in combination with a substance whose origin from, or afiinit with the Proteins...show more

Product details

  • Paperback | 906 pages
  • 189 x 246 x 45mm | 1,583g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123678023X
  • 9781236780232