Psychology / by William James.

  • James, William, 1842-1910.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Psychology / by William James. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    9 fact a little camera obscura, the essential part of which is the sensitive plate. The retina is what corresponds to this plate. The optic nerve pierces the sclerotic shell and spreads its fibres radially in every direction over its in- side, forming a thin translucent film (see Fig. 3, Bet.). The fibres pass into a complicated apparatus of cells, granules, and branches (Fig. 4), and finally end in the so-called rods and cones (Fig. 4,—9), which are the specific organs for taking up the influence of the waves of light. Strange to say, these end-organs are not pointed for- ward towards the light as it streams through the pupil, but backwards to- wards the sclerotic membrane itself, so Ch Fia. 4. Fio 5 —Scheme of retinal fibres, after KUss. Nnp optic nerve: .S, sclerotic: Ch. choroid; K, retina; papilla (blind spot): F, fovea. that the light-waves traverse the translucent nerve-fibres, and the cellular and granular layers of the retina, before they touch the rods and cones themselves. (See Fig. 5.)