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THE EVOLUTION OF WORLDS
Wolf-Rayet stars, due to hydrogen, helium, and so forth. These later observations make practically certain
Nebula M. 51 Canum Venaticorum—After Ritchey.
what earlier ones permitted us just now only to infer: that it is not composed of stars, but of something subtler still; to wit, of meteorites. The reasoning is interesting, as showing that if one have hold of a true idea, the stars in their courses fight for him.
Although Lockyer has long been of opinion that the
