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 Plate 18.—This plate shows eight half-tone colors produced by two-color mixtures of different mixed colors with white. Some of the best effects in the combination of colors can be obtained with half-tone colors, as illustrated on Plates 33 to 37, inclusive. Figs. 133, 140, and 145. are half-tone reds. Figs. 135 and 139 are half-tone blues. Fig. 138 is a half-tone purple. Fig. 143 is a half-tone violet. Fig. 142 is a half-tone blue-green, and Fig. 148 is a half-tone green-blue. Pig. 144 is a half-tone olive.

Plates 19 to 21, inclusive.—These plates show a variety of beautiful tints. Plate 19 shows ten tints produced by mixtures of the colors on Plate 1 with white. Plates 20 and 21 show twenty different tints produced by mixtures of different mixed colors with white. All of these tints were printed with the cut shown below.

We tried to produce as great a variety of useful tints as possible, and think that the reader will surely be able to get what is desired out of this selection. The value of these tints is illustrated in many of the combinations of colors shown in this work.

Plates 22 to 28, inclusive.—These plates show a variety of colors, hues, etc., produced by the lapping of different colors of