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The purpose of the work here reported was threefold. firstly, to verify early experimental results on legibility of colored letters on colored backgrounds, the origin of which is somewhat shrouded in hearsay but which Luckiesh 1 traces as far back as a quotation from Le Courrier du Livre, which was printed in Scientific American Supplement, Feb. 2, 1913 These results will be for convenience sake referred to hereafter as those of Luekiesh.In the second place it is proposed to enlarge the number of color-combinations from 13 to 42.These forty-two combinations are obtained from seven colors, namely, Red, Yellow, Blue, Green, "White, Black and Gray, by making every possible different combination of lettering and background out of these colors. The original colors here used were of medium chroma and tint equivalent to De Voe's standard showcard colors.The lettering consisting of digits and letters (6 units to a cardboard) were stenciled with De Voe's showcard colors.Five subjects were used, one at a tune and only on uniformly clear days. Measurements were made of the maximum distance at which legibility of copy in its entirety was possible. In this regard the procedure was not unlike that used in visual acuity tests save that the subject came forward until he could just read correctly the characters. The distancerecords for the 42 combinations were ranked by subjects and average legibility rankings for various combinations were then ranked. The experiment was an outdoor one, owing to distance requirements. i'' Color and Its Application.'' 201