Lowell, Percival, 1855-1916 · New York, The Macmillan Company · leaf 73
Nebula N. G. C. 6960 IN Cygnus AFTER Ritchey. tinuous. Thus that of the Andromeda nebula showsvery faint dark lines crossing it, apparently accordantwith those of the solar spectrum and faint bright onesfalling near and probably coincident with those of the 48 THE EVOLUTION OF WORLDS Wolf-Rayet… … Nebula M. 51 Canum Venaticorum— AFTER Ritchey. tain what earlier ones permitted us just now only to in-fer: that it is not composed of stars, but of somethingsubtler still; to wit, of meteorites. The reasoning isinteresting, as showing that if one have hold of a trueidea, the stars in their courses…
Cosmogony
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