IN answer to Mr. Podmore's question in NATURE, vol. xix. p. 73, as to the appearance to me of the green of the solar spectrum, I may say that such part of it as inclines to yellow is seen by me as faint yellow, and such part of it as inclines to blue is seen by me as faint blue. The line of division, which I may call neutral green, appears simply colourless or white; there is no dark space, no pigments; neutral green appears to me gray.

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