. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. VISION. S79 ,boiit twelve I to the eye, at that dis- of entrance 1 a mark on iter outward ation of the ement till it iess may be tal, and, by ,ed, marking lere is really icted on the ly peroeiTed. at dMNToM; ir iraaalar lajrer; the retina is kyers of rods and con s is convincing. If it c
. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. VISION. S79 ,boiit twelve I to the eye, at that dis- of entrance 1 a mark on iter outward ation of the ement till it iess may be tal, and, by ,ed, marking lere is really icted on the ly peroeiTed. at dMNToM; ir iraaalar lajrer; the retina is kyers of rods and con s is convincing. If it could be shown that parts of the retina itself internal to these layers cast perceptible shad- ows, the conclusion that the rods and cones are the essential parts of the sensory organ would be inevitable. The following experiment proves this: When a light is moved backward and forward (to prevent retinal fatigue) before the eye, so that the rays from it enter the organ, while the subject, standing in a dark room, gazes toward a plain-colored wall, his accommoda- tion being relaxed, he will behold radiating shadows, somewhat suggestive of the leafless branches of an old tree. These cor- respond with the picture of the retinal vessels as ascertained by an examination of the eye with the ophthalmoscope. Some persons always see the shadows of the blood-corpuscles also; and, in fact, one physiologist has, by observing these, calculated the rate of the blood-flow in the retinal vessels. Instead of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York : D. Appleton; London : Caxton House
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License: Licensed
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
