_Vanderpoel, Emily Noyes._—Color Problems. A Practical Manual for the Lay Student of Color. With one hundred and seventeen colored plates. Longmans, Green and Co., New York, London and Bombay. 1903. Small 8vo., pp., [i-vi] vii-xv, [1-2] 3-137. The colored plates of this excellent work illustrate the physics and psychology of color, color harmonies, and kindred subjects, but have no relation to color nomenclature. _Jorgensen, Charles Julius._—The Mastery of Color. A simple and perfect color system, based upon the spectral colors, for educational and practical use in the Arts and Crafts. Published by the Author. Milwaukee, 1906. 8vo., 2 vols., one of text, the other of 22 loose colored plates contained in double box. An exceedingly useful work for artists and decorators, but not adapted to the needs of science. The technical execution of the plates is exquisite and the colors very fine. FOOTNOTES [1] A | Nomenclature of Colors | for Naturalists, | and | Compendium of Useful Knowledge | for Ornithologists. | By | Robert Ridgway, | Curator, Department of Birds, United States National Museum. | With ten colored plates and seven plates | of outline illustrations. | Boston: | Little, Brown, and Company. | 1886. | (12mo., pp. 129, pls. 17.) The subject of color and color nomenclature discussed on pages 15-58. Plates i-x, inclusive, represent 186 named colors, hand-painted (stencilled). [2] Titles of several books on the subject which are especially recommended to the lay student of chromatology are given at the end of this text. [3] See _Science_, June 9, 1893, and _Nature_, Vol. LII, No. 1347, Aug. 22, 1895, pp. 390-392. [4] According to Aubert more than 1000 hues are distinguishable in the spectrum, though among them all the hues between violet and red are wanting. [5] That is to say, the practical limit for pictorial representation of the colors in their various modifications. [6] Milton Bradley: Elementary Color, p. 18. [7] See colored figure on frontispiece.