. 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. 687 >graph. It ts only red It is occa- d blue may i and green t to ascer- n their in- of ten make ons, but, in ects. It is the extent colors, le explana- indness, ac- I is theab- ) the colors nary sensa- ect of this lieory such ;olor-vision ae. But, if Las been as- tner wou
. 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. 687 >graph. It ts only red It is occa- d blue may i and green t to ascer- n their in- of ten make ons, but, in ects. It is the extent colors, le explana- indness, ac- I is theab- ) the colors nary sensa- ect of this lieory such ;olor-vision ae. But, if Las been as- tner would; g's theory, ler is broad iple. They better are the physi- r what we all that we { the outer J one time; eyes. a its center ing a point up or down, to the right or the left, he may ascertain the limits of the visual field for a plane surface. The visual field for both eyes measures about 180° in the horizontal meridian; for one eye about 145°; and in the vertical meridian 100°. Lapcrfcotioiis of Vinul PuDoepUaniiâWe may now consider some defects which we know to exist by the use of our reason- ing powers in the mental perception we form of objects in the visual field: 1. Irradiation.âIt is easy to notice that a white spot on a dark ground appears larger than a dark spot of equal size on a white ground. This has been spoken of as the result of. Fio. «M.ânhMtntw imkUatiim. The iriiito patch in the (bwfc (tround i dark one tai the light grauiid (after Bematetn). I langer than the irradiationâa sort of overflow of sensation, though whether to be referred to the retina or to the brain-areas concerned is uncertain. 2. Contrast.âWhen a white strip of paper is laid between two black ones, the center of the white strip is not so bright as its edges, from contrast; and experiments illustrating the same principle may be made with colored paper. This law of con- trast is very wide in its application, and will be referred to later. - , 3. The Mimd-Spot.âIt might b
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
