File:Physiology, hygiene and sanitation, an elementary textbook of physiology, with special attention given to hygiene and sanitation (1919) (14742210256).jpg

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Description
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Identifier: physiologyhygien00heiz (find matches)
Title: Physiology, hygiene and sanitation, an elementary textbook of physiology, with special attention given to hygiene and sanitation
Year: 1919 (1910s)
Authors: Heizer, W. L. (W. Lucien), b. 1880
Subjects: Physiology Hygiene Sanitation
Publisher: Louisville, Ky., C.T. Dearing Printing Co., Incorporated
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
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Fig\ 142.—The eyeball protected by its bonysocket in the skull. A. Eyeball. B. Bonpsof the skull. C. Muscles of the eye. D.OiDtlc nerve. 290 SEEING 291 The Eye is a spherical shaped body about one inch indiameter. It is almost round like a marble, except at thefront side where its surface bulges out. It is surroundedby a mass of fat, muscles, and connective tissue andmoves freely by the action of its muscles. Six muscles move the eyeball, one is attached at itsupper and lower sides and one at its inner and outer
Text Appearing After Image:
Figr. 143.—The eyeball viewed in front. A. Muscles tomove the eye up, down, in and out. B. Muscles toroll the eye. C. Iris. D. The pupil. E. Union ofthe sclerotic coat and cornea. sides and two are so attached that the eyeball can berotated or turned in any oblique direction. It is by action of these muscles that we look up anddown, sidewise, either in or out, or roll the eyesaround. 292 PHYSIOLOGY, HYGIENE AND SANITATION The eye in front is provided with a window throughwhich the light enters. It is a perfectly transparent mem-brane (cornea) and it joins the white membrane (sclero-tic) of the eyeball. The color of the eyes7 is due to the coloring matterin the curtain (iris) which is seen just inside the eye.The pupil is the round hole in the curtain and it admitslight into the deeper parts of the eyeball. The pupil sometimes islarge andagain small.In verybright sun-light thepupil is leastand in dark-ness it islargest insize. Thefunction ofthe iris,which is sup-plied withtiny muscle

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  • bookid:physiologyhygien00heiz
  • bookyear:1919
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Heizer__W__L___W__Lucien___b__1880
  • booksubject:Physiology
  • booksubject:Hygiene
  • booksubject:Sanitation
  • bookpublisher:Louisville__Ky___C_T__Dearing_Printing_Co___Incorporated
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:292
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
InfoField
28 July 2014

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