Abstract
IT is a fortunate circumstance for students of nebular astronomy that within a short time that branch of science has been enriched by a monograph and a photograph, each perfect in its way, of one of the grandest objects in the heavens. The monograph is from the pen of Prof. Holden,1 whose name is a guarantee of thoroughness; the photograph we owe to Mr. Common, who at one bound has distanced all predecessors, and has shown us that in the future we may hope for permanent records of the nebulæ as perfect as those of the surfaces of the sun and moon produced by Janssen and Rutherfurd.
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