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 Selection No. 3 of tablets contains, in addition to the twelve scales of broken colors, six colored grays, which must at some stage be considered in connection with gray colors or broken colors, to which they are closely related. As has already been stated, there is a point where by the continued addition of gray to a color, the color is so far obscured that its identity is practically lost and the result becomes a colored gray.

Although the line between gray colors and colored grays cannot be definitely drawn there are so many grades visible beyond the point where the exact color used with the gray can be determined, that the term "colored gray," which covers the three classes, warm, cool and green grays, is convenient for common use.

It is very desirable that a distinction be observed between the terms "colored grays" and "gray colors," and therefore broken colors may be a better term to apply to the gray colors because a distinction is thus more strongly emphasized between these two classes of colors.

The following table furnishes formulas from which the colors of the Chart of Broken Spectrum Scales may be very nearly imitated on the High School Color Wheel. Each scale should be shown by the three smaller sets of disks, namely, the smallest for light tone, next size for standard or medium, and the third size for darkest tone.

This list of disk combinations is furnished here for the convenience of teachers who may have occasion to illustrate the compositions of the various classes of colors comprised in the Chart of Broken Spectrum Scales, which covers the entire range of the aesthetic colors and from which by modifications every subdued color in material substances can be analyzed and and definitely named.

Owing to the color usually found on the interior of a schoolroom and the lack of pure white light from outside it is not probable that these proportions will exactly match the papers, but the formulas will enable the teacher to approximate the