The hydropathic encyclopedia : a system of hydropathy and hygiene in eight parts ..designed as a guide to families and students, and a text-book for physicians . f these coincident vibrations, are the sounds concord-ant or discordant. The most agreeable concord is, of course, thatwhere every vibration of one sound and every other vibration of an-other sound come together. The Sense of Sight.—Vision makes us acquainted with the exist-ence of light, by which medium the mind recognizes the form, sizecolor, position, etc., of bodies that transmit or reflect it. The roots of the optic nerves unite,
The hydropathic encyclopedia : a system of hydropathy and hygiene in eight parts ..designed as a guide to families and students, and a text-book for physicians . f these coincident vibrations, are the sounds concord-ant or discordant. The most agreeable concord is, of course, thatwhere every vibration of one sound and every other vibration of an-other sound come together. The Sense of Sight.—Vision makes us acquainted with the exist-ence of light, by which medium the mind recognizes the form, sizecolor, position, etc., of bodies that transmit or reflect it. The roots of the optic nerves unite, before entering the orbits, intointimate junctions, called chiasms, from these chiasms they divergeand enter the orbit through the optic foiamina, part of the fibres ofeach passing to the opposite eye, a part being connecting or comraisu-ral, and the remainder passing to the eye of the same side. Thisarrangement seems to associate the two eye6 in a single act of vision,although most physiologists regard th single vision with two eyes as aresult of the rays of light from a luminous object falling upon parts of the retinae accustomed to Fig. OPTIC CHIASM. act together. Fig. 129 is a representation i,tthe coarse of the fibres of theoptic nerve in the chiasm, fibres, connnisurnl be-tween the two retinas, p. Pos-terior fibres, commisural betweenthe thalami, or origin of the opticnerves, a Diagram of thopreceding. The essentiiil parts of the eye are, the expansion of the optic nerve,called retina, which feels the impressions of light, and the transparentrefracting media, or humors of the eye, which transmit the light so aslo bring it to a focus upon the retina. The sclerotic forms a firm sun-port to the globe, and is opake, except in front, where it, becoir stransparent for the admission of the rays of light, and is called corn, dark pigment called choroid, between the sclerotic and retina, nb-sorbs the rays of light after they have impressed the retina.
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