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N THE foregoing pages an attempt is made to explain clearly and as briefly as possible the principles on which the Bradley system of color instruction is based, and also to suggest a few definitions necessary to an intelligent discussion of the general subject of Color, Owing to the peculiar nature of the questions involved, demonstration by actual experiment is more convincing than the mere statement of theories can possibly be, and therefore a few of the following pages

will be devoted to the explanation of some valuable experiments, all of which may be tried by the teacher in private, while many of them can be shown the pupils with great advantage.

In this system the Maxwell color disks are the means for color combinations and the basis for measurements, and therefore for a color nomenclature. For this reason the present chapter treats largely of the proper use of # the w'heel and incidentally the theory of red, yellow and blue primaries with combinations to produce secondaries Fig. 2. and tertiaries. No teacher using the

material connected with this color scheme can- hope to meet with success without a knowledge of the principles on which it is based, and in this subject as in all others, it is essential that the teacher shall know much more of it than he or she is ever required to teach.

For most convenient use the machine should be clamped to the front of a table and near one end, so that the speaker using it can stand at the end of the table and operate it with the