As the phenomenon of a colourless rainbow, which was seen here in the forenoon of Thursday the 10th January, seems to be very rare, never having been witnessed before either by myself or by any of my friends to whom I have mentioned the subject, I beg to offer the Society the following description:—

On my way that forenoon to the Botanic Garden, and arriving about a quarter-past eleven at the open view of the north at the bottom of Pitt Street, my attention, was arrested by the appearance of a magnificent white bow, visible in its entire arch from end to end in the northern sky.