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A 4° square, two-part photometric field, symmetrical about a vertical division and viewed through a pupil 3 mm in diameter, is illuminated in both parts by artificial sunlight at a constant brightness of about 3 or 4 mL (retinal illumination, 70 to 90 photons) with a surrounding field of about 0.5 mL. Homogeneous light is added to one half, and sunlight simultaneously subtracted so that the field remains matched in brightness. Two adjustments of the mixture are made: (1) The least purity perceptible with certainty (Pm .. ), and (2) the greatest imperceptible purity (Pmin)' The purity of these mixtures is then measured, increased accuracy being obtained by measuring a known large multiple of the homogeneous brightness. Values of Pm .. and Pmin have been obtained as a function of the wave length of the homogeneous component; thece values are reported in detail, and some diseussion of their interpretation is given. CONTENTS Pago I . Introduction      673 II. Procedure  ___  __    ___ 674 1. Adjustment of the mixture   674 2. Photometric measurement of the components __  ___  674 3. Precautions and auxiliary studies  675 III. Results  __ __  676 IV. Discussion  679 1. Comparison with other work    679 2. Interpretation ___ ____ ____  __ 681

Minimum perceptible colorimetric purity as a function of dominant wave length