. Elements of human physiology. Physiology. 564 I'JIYHIOLOGY out bisected, and the retina removed and examined by a weak light, it will be found that this latter has a purplish- red colour. On microscopical examination this colour is seen to be confined to the outer limbs of the rods. After a very short exposure to diffuse daylight the colour disappears. The colouring matter {rlio clop sin) may be dissolved out by means of a solution of bile salts. The purple-red solution thus formed also bleaches rapidly on exposure to light. By means of this rhodopsin, photographs or ' optograms' of external
. Elements of human physiology. Physiology. 564 I'JIYHIOLOGY out bisected, and the retina removed and examined by a weak light, it will be found that this latter has a purplish- red colour. On microscopical examination this colour is seen to be confined to the outer limbs of the rods. After a very short exposure to diffuse daylight the colour disappears. The colouring matter {rlio clop sin) may be dissolved out by means of a solution of bile salts. The purple-red solution thus formed also bleaches rapidly on exposure to light. By means of this rhodopsin, photographs or ' optograms' of external objects may be taken on the retina. The frog's eye which is cut out is placed in front of a window. After some time the eye is bisected and plunged into a 4 per cent, solution of alum, which fixes the optogram, and a permanent Fui. 25( 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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