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<p>The author has previously deduced, using Koenig's data on the subject, the visibility (/b i.e/., the relative luminous effect produced by a certain energy) throughout the spectrum. He now finds that a correction is necessary owing to the effect of Koenig's prismatic dispersion curve not having been allowed for previously. The effect of this is to alter substantially the positions of the maxima of the visibility curves at high and low illuminations; these should now be situated at 0.544mu and 0.503mu respectively, and they may now be assumed to be the qualities of light to which the eye is most sensitive, for strong and extremely weak light.
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<br>Subjects: rays and radiation; vision</div>
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Nutting, P.G.</div>
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