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 conclusion that there are eight different harmonies of colors, and have arranged them into two series, as follows :

, which includes:

The Harmony of Scale—by Contrast of Tone. The Harmony of Scale—by Gradation of Tone. The Harmony of Relative Colors—by Contrast of Tone. The Harmony of Relative Colors—by Gradation. The Harmony of a Dominant Color.

, which includes:

The Harmony of Distant Colors—Equal in Tone. The Harmony of Distant Colors—by Contrast of Tone. The Harmony of Colors with black.

is meant the harmony of two or more colors, in each of which, one color is plainly perceptible. For example, orange and purple are near relatives of red, while orange-yellow and violet-blue are distant relatives of red; and the different tones and hues of red are its nearest relatives.

The Harmony of Scale—by Contrast of Tone is produced by the combination of two or more tones of one color, between which there is a decided difference. For example, see Figs. 284, 285, and 286, Plate 39, which shows three different three-color combinations of full-tones, half-tones, and tints; also Figs. 287, 288, and 289, on Plate 40. Fig. 287 is composed of one of the light, and two of the dark tones of red; Fig. 288 is composed of three of the dark tones of yellow; Fig. 289 is composed of a dark tone, full-tone, and half-tone of red. Also, Plate 42 which shows olive and its tint, and Plate 48 which shows sea-green and its tint.