the more broken or subdued colors have been chosen after very careful consideration, because they are intended for elementary instruction and therefore should be so far removed from the pure color scales as to impress themselves on the minds of the children as a distinct and representative class of colors. When the color sense of the pupils has been sufficiently cultivated to observe smaller distinctions, a variety of color scales much less broken may be shown with the disks.
Different selections for a score of charts could be made, all beautiful and representing broken colors, but after much consideration these thirty-six were selected from a very large number of hand-painted samples made for the purpose, as furnishing a sufficient number of typical, broken colors for elementary color instruction, and in such hues and tones as to form a harmonious chart for comparison with the Chart of Pure Spectrum Scales.
When the children have advanced far enough to understand the analysis of a color, i. e., to correctly name a color, exercises which may be called color puzzles can be introduced from time to time with great interest and profit.
The idea is simply to suddenly show to the class a series of disks in rapid rotation and ask them to guess what colors it is composed of, i. e., what the definite name of the color is.
The following is a suggestion for this exercise, supposing that a broken green yellow is to be shown:—
Select a green, a yellow, a white and a black disk of medium size and combine them as follows: Y. 20, G. 10, W. 10, N.60. Then, having previously removed the nut from the spindle of the wheel and laid it in a convenient place, take the combined disks and lay on the top of them any other disk of a larger size, with the center holes of all corresponding with each other and place all these disks on the spindle of the wheel with the larger disk still covering the face of the others. Having previously furnished an assistant with a sheet of cardboard of suf-
