Note 20 — HOW TO FORETELL WEATHER.

Indications of weather, afforded by colours, seem to deserve more critical study than has been often given to the subject. Why a rosy hue at sunset, or a grey neutral tint at that time, should presage the reverse or their indications at sunrise;—why bright yellow should foretell wind at either time, and pale yellow, wet;—why clouds seem soft, like water colour; or hard edged, like oil paint, or Indian ink on an oily plate;—and why such appearances are infallible signs—are yet to be shown satisfactorily to practical men.