File:Comparative zoology, structural and systematic - for use in schools and colleges (1883) (20677648841).jpg

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Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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182 COMPARATIVE ZOOLOGY.
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and either convex or flat on the other, so that it produces a focus like a lens. Be- hind the cornea, or lens, is the pigment, having a minute aper- ture or " pupil." Next is a conical tube—one for each facet — with sides and bottom lined with pigment. These tubes converge to the optic ganglion, the fibres of which pass through the tubes to the cornea.96 Vision Fig. 156.—Eye of a Beetle (Melolontha): A, section; such a Compound a, optic ganglion; b, secondary nerves; c, retina; J * d, pigment layer; e, proper optic nerves; B, group eye is not a mosaic ; of ocelli; /, bulb of optic nerve; g, layer of pig- ment; h, vitreous humor; i, cornea. but each OCelluS gives a complete image, although a different perspective from its neighbor. The multiplied images are reduced to one men- tal stereoscopic pict- ure, on the principle of single vision in ourselves. The eyes of the Cuttle-fish are the largest and the most perfect among Inver- tebrates. They re- semble the eyes of higher animals in hav- ing a crystalline lens with a chamber in front (open, however, to the sea-

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  • bookid:comparativezool00orto
  • bookyear:1883
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Orton_James_1830_1877
  • bookauthor:Birge_E_A_Edward_Asahel_1851_1950
  • booksubject:Zoology
  • booksubject:Anatomy_Comparative
  • booksubject:Physiology_Comparative
  • bookpublisher:New_York_Harper_Bros_
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:190
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
18 August 2015


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