Color-vision and color blindness, a practical manual for railroad surgeons (1920)
Jennings, John Ellis · Philadelphia F.A. Davis · leaf 26
are conical or pear-shapedbodies one-half the length of tlie rods, and terminate in PHYSIOLOGICAL ANATOMY OF THE RETINA. 9 a looped extremity. According- to Norris and Wallace ^^(see Fig. 2), the looped extremity passes down over thebody of the cone, and, after some convolntions in tlioposition of… … Fig. 2.—Layer of Rods and Cones. X 900 Diani. (Xorris and Wallace.) marking was thought to indicate a structure composedof disc-like bodies, but Norris and AVallace find that thelongitudinal markings can be traced from nearly thebases of the cones, and are seen to undergo a twistingwhich, on the…
Color-blindness · Eye
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