Abstract
THE RING NEBULA IN LYRA.—The appearance of the brightest of the ring nebulæ, as seen with the Lick 36-inch refractor, is described by Prof. Barnard in Ast. Nach. No. 3354. The aperture of the ring was filled with a feebler nebulosity, which was estimated to be nearly midway in brightness between the brightness of the ring and the darkness of the adjacent sky. This aperture was more nearly circular than the outer boundary of the nebula, so that the ends of the ring were thicker than the sides. The following end of the ring had a slightly greater extension, which was less bright than the ring itself, and the entire nebula was of a milky colour. The central star was usually seen, but was never a very conspicuous object. The brightest region of the nebula lies in the northern part. Micrometric measurements of the nebula gave the following mean results:—
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