. Popular science monthly. of theapposing areas. By applying these principles in picture painting un-saturated hues may be caused to assume much greater degrees of satura-tion while, if the apposition be false, hues in themselves of almost com-plete saturation may become dull and subdued. To the artist it comes to be of the highest importance that hepossess some easily remembered scheme by which he can predict thesecontrast effects. The color triangle may be thus employed, but asimpler, though perhaps less scientific device, for the same purpose isthe chromatic circle of Eood. To construct suc
. Popular science monthly. of theapposing areas. By applying these principles in picture painting un-saturated hues may be caused to assume much greater degrees of satura-tion while, if the apposition be false, hues in themselves of almost com-plete saturation may become dull and subdued. To the artist it comes to be of the highest importance that hepossess some easily remembered scheme by which he can predict thesecontrast effects. The color triangle may be thus employed, but asimpler, though perhaps less scientific device, for the same purpose isthe chromatic circle of Eood. To construct such a circle we must knowthe wave-lengths of the various colors which we desire to Thedifferences in wave-lengths are then calculated so as to correspond toangular differences, these angles being formed by the radii of the in the color triangle, opposite radii will join complementary colorsand the center will represent white light, i. e., the nearer the center theless will be the saturation of the ?9-* Fig. 2. Roods Chromatic Circles as used to show the Influence of one Color) on the others. If one such circle, drawn on transparent paper, be superimposed onanother, the effect which is produced by contrasting two colors can bereadily ascertained. Thus, suppose we desire to determine the influencewhich red has when contrasted with the other colors. Having accu-rately superimposed the two circles we move the transparent one so thatthe point on it which corresponds to red is displaced along the linejoining red and its complementary, blue-green. The colors on the uppercircle will now stand in positions on the lower corresponding to the 3 This can be done by comparing the colors with those of a highly magnifiedspectrum of white light alongside of which is a scale of wave-lengths. PHYSIOLOGY OF COLOR VISION 459 changes in Ime and saturation which, they would have suffered by con-trast with red. Thus orange will stand nearer the center and somewhatnearer yell
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