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8o Publications of the of approach, at the same time broadening the lines. It will be easy for the reader to determine the effect of a motion of either kind in a streamer making a given angle with the observer's line of sight, and space will not be taken here to summarize further the general effect. It is evident that a dark-line spectrum, if one of sufficient density and dispersion could be obtained, would be of great complexity. However, a knowledge of the motions within the corona woulddoi:10.1086/121725 fatcat:222b5fhhpnb2jiv234fvxxxl44