. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. Fig. 389.—Diagram illustrating Irradiation. (Stirling.) If this diagram is held gome distance from the eyes, especially if not exactly focused, the white dot will appear larger than the black, though both are exactly of the same size. When rays of light from a strongly luminous body fall upon the retina the}- are not confined exactly to the precise points upon which they impinge, but extend themselves to a greater or less degree around them. Thus, if we make a circular white spot upon a black ground, and a
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. Fig. 389.—Diagram illustrating Irradiation. (Stirling.) If this diagram is held gome distance from the eyes, especially if not exactly focused, the white dot will appear larger than the black, though both are exactly of the same size. When rays of light from a strongly luminous body fall upon the retina the}- are not confined exactly to the precise points upon which they impinge, but extend themselves to a greater or less degree around them. Thus, if we make a circular white spot upon a black ground, and a black spot of corresponding dimensions upon a white ground, the former will appear considerably larger than the latter, apparently, be- cause the excitation of the retina by the luminous impression tends to spread itself over the adjacent unexcited space (Pigs. 389, 390, and 391). The same phenomena are seen when the experiment is performed with. 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 Smith, Robert Meade, 1854-. Chicago, A. Eger
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