DURING this summer I have seen only one display of the “sky-coloured” clouds, or “night-shining clouds” as the late Herr O. Jesse used to call them. It was on July 8, and was a bright display, the brightest I have seen for some years. It is rather singular they did not appear on other occasions so far as I have observed, and no mention of them has been made in your periodical. It may be that now Herr Jesse is deceased there has not been such a good and systematic watch maintained as formerly, or else, if they have been observed abroad, notices have not been copied into English papers. Whether the brilliancy of this one display was connected with the eruptions in the West Indies is a matter of conjecture. The volcanic dust continues to be very visible in the sky in producing the great corona round the sun all day.