Abstract
IF in my letter in NATURE of Dec. 3, I am understood to have suggested that the green flash seen at sunset had no cause other than a physiological one, I withdraw any implied or hinted suggestion in that direction; for it is evident that a great weight of authority is in favour of a physical cause. My letter, indeed, admitted the likelihood of greenish atmospheric effects; but I wished to contribute a simple fact of observation, which suggested to me—and still suggests—that a suddenly disappearing light may stimulate a momentary green sensation in some persons, even when atmospheric and other conditions for actual colour are absent.
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