. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ial layer ofcornea; 14. Descemets membrane; 15, pectinate ligament of iris; 16, epitheliumof membrane of Descemet; 17, union of sclerotic coat with cornea; 18, section ofcanal of Schlemm. nervous expansion. The eye of the mammal may be regardedas an arrangement of refracting media, protected by coverings,with a window for the admission of light, a curtain regulatingthe quantity admitted; a sensitive screen on which the imagesare thrown; surfaces for the absorption of superfluous light
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ial layer ofcornea; 14. Descemets membrane; 15, pectinate ligament of iris; 16, epitheliumof membrane of Descemet; 17, union of sclerotic coat with cornea; 18, section ofcanal of Schlemm. nervous expansion. The eye of the mammal may be regardedas an arrangement of refracting media, protected by coverings,with a window for the admission of light, a curtain regulatingthe quantity admitted; a sensitive screen on which the imagesare thrown; surfaces for the absorption of superfluous light ;apparatus for the protection of the eye as a whole, and for pre-serving exposed parts moist and clean. Embryological.—We have already learned that the first indi-cation of the eye is the formation of the optic vesicle, an out-growth from the first cerebral vesicle. This optic vesicle be- VISION. 329 comes more contracted at the base, and the optic stalk remainsas the optic nerve. At an early stage of development (second or third day in thechick) the outer portion of the optic vesicle is pushed inward,.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
