Abstract
SINCE the year 1880, when Henry Draper, of New York, achieved the first success in photographing nebulæ, namely, the great nebula in the constellation of Orion, the progress made in this branch of astronomy has been both rapid and secure. In this country Common and Isaac Roberts, in France Janssen and the brothers Henry, in Germany Max Wolf, and in the United States W. H. Pickering, Barnard, and Keeler, all have helped to obtain the high standard of excellence which prevails to-day.
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