THE coloration of the sky in the neighbourhood of the sun, described by “B. W. S.” in NATURE of March 27 (p. 503), has been repeatedly observed by myself from February 20 (or thereabouts) up to March 24. My first record of it is on February 24, when I describe it as a “rusty-red” tint. On other occasions I have called it “rusty brown” and “pale brick-red.” Sometimes it has had a purplish or roseate hue. It has been chiefly seen between 10° and 20° from the sun (at a rough estimate), and only when the sun was hidden by a detached cloud. Frequently, when the sky has been clear, the intervention of a house or other object between the observer and the sun has revealed the presence of a hazy metallic-looking glare around the sun—an appearance not perhaps very remarkable in itself, but remarkable by its frequent repetition.