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Psychology (1892)


Psychology (1892)

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    Available in PDF Format | Psychology (1892).pdf | Unknown
    William James
Excerpt from book: CHAPTER III. SIGHT. The Eye's Structure is described in all the books on anatomy. I will only mention the few points which concern the psychologist. It is a flattish sphere formed by a tough Tlie student can easily verify the coarser features of the eye's anatomy upon a bullock's eye, which any butcher will furnish. Clean it first from fat and muscles and study its shape, etc., and then (following Golding Bird's method) make an incision with a pointed scalpel into the sclerotic half an inch from the edge of the cornea, so that the black choroid membrane comes into view. Next with one blade of a pair of scissors inserted into this aperature, cut through sclerotic, choroid, and retina (avoid wounding the membrane of the vitreous body!) all round the eyeball parallel to the cornea's edge. The eyeball is thus divided into two parts, the anterior one containing the iris, lens, vitreous body, etc., whilst the posterior one contains most of the retina. The two parts can be separated by immersing the eyeball in water, cornea downwards, and simply pulling off the portion to which the optic nerve is attached. Floating this detached posterior cap in water, the delicate retina will be seen spread out over the choroid (which is partly iridescent in the ox tribe): and by turning the cup inside out, and working under water with a camel's-hair brush, the vessels and nerves of the eyeball may be detected. The anterior part of the eyeball can then be attacked. Seize with forceps on each side the edge of the sclerotic and choroid (not including the retina), raise the eye with the forceps thus applied and shake it gently till the vitreous body, lens, capsule, ligament, etc , drop out by their weight, and separate from the iris, ciliary processes, cornea, and sclerotic, which remains i...   show more
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  • PDF | 346 pages
  • William James
  • General Books LLC
  • Unknown
  • 7
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