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The d evelopment of the Inter-Society Color Council-National Bureau of Standards (ISC C-NBS) system Qf color names, based on the standards in the Munsell Book of Color, made it necessary to specify the mas ter standards of this book in fundame ntal terms. Accordingly, spectral reflection curves were run for each of the 421 master standards on the General Electric recording spectrophotometer at the National Bureau of Standards, using slit widths of a pproximately 4 millimicrons. Various corrections were applied to these spectrophotometric data in accordance with methods regularly used for such work at the bureau. Colorimetric computations were then made with these data, resulting in tristimulus specifications according to the 1931 ICI standard observer and coordinate sy stem. :Four illuminants were used: ICI illuminants A and C, representati ve of incandescent-lamp light and average daylight, respectively, illuminant "D" (li ghtly overcast north sky), and illuminant "8" (extremely blue sky).

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The terms irradiate and irradiation, as emphasized by H. E-Ives (Astro. Journ., XLV, p. 39; 1917), should be used analogously to the terms illuminate and illumination when radiant energy rather than light is discussed.