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At various times during the past ten years, the gist of these pages has been given in the form of lectures to students of the Normal Art School, the Art Teachers’ Association, and the Twentieth Century Club. In October of last year it was presented before the Society of Arts of the Massachusetts Institute of Technology at the suggestion of Professor Charles R. Cross.

Grateful acknowledgment is due to many whose helpful criticism has aided in its development, notably Mr. Benjamin Ives Gilman, Secretary of the Museum of Fine Arts, Professor Harry E. Clifford, of the Institute, and Mr. Myron T. Pritchard, master of the Everett School, Boston.

An Atlas of Pigment Color, long delayed by the difficulty of exact reproduction, accompanies this edition. Its measured scales of hue, value, and chroma, tested by appropriate instruments such as a daylight photometer, spectroscope, and Maxwell discs, serve to collect many imdividual records and establish a norm, or average, of color discrimination. These charts, three of