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 will of course depend upon the scope of the given comparator system and in general will be only approximate.

In will be found color excitation values for various Munsell pigments as seen under average noon sunlight. The equivalents of certain Ridgway colors in terms of monochromatic analysis have been given in. As already noted, the excitation equivalents of many colors in Ostwald’s pigment system have been computed very carefully by Kohlrausch in a recent article. In subsequent reports the committee will endeavor to provide values for further standards, both in these two and other systems, such as that utilized in the Lovibond tintometer.

The above report, being a more or less pioneer effort of its kind, must naturally be regarded as incomplete and tentative. However, the purpose of the report is an earnest one and is directed towards at least four ends; (1) the clarification and standardization of color terminology, (2) the compilation of data which are fundamental to color science, (3) the specification of standard stimuli and conditions, for use in practical color work, and (4) the encouragement of discussion and research along these lines. An outline of the contents of the present report is given at the beginning in the form of a Table of Contents. It is hoped in later reports by the present Committee to deal more specifically with details in the terminology and application of the various methods for colorimetry as well as with the design of instruments for the utilization of these methods. Finally, the Committee desires to express once more its wish that workers in the field of color science communicate freely their criticisms and specific needs.


 * No attempt is made here to summarize the progress in color science during the years, 1920-21, since this topic has been treated by the Chairman of the Committee in general summaries published in the American Journal of Physiological Optics, October 1921, pp. 316-391, and forthcoming.

1., , 3, p. 135; and also Letter of Nov. 17, 1917, to the Bureau of Standards. 2. . London, 1891.