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And what of that other unknown element we find glowing green in the far-flung nebulae green as that we had just passed through and that we call nebulium? Yet the sun is child of the nebulae as the earth is child of the sun and the moon is child of the earth. And what miracles are there in coronium and nebulium which, as the child of nebula and sun, we inherit?
The gas "nebulium," not yet found on the earth, is the most characteristic constituent of irregular nebulæ. He points out that the old contraction hypothesis, according to which the source of solar and stellar heat was supposed to reside in the slow condensation of a radiating mass of gas under the action of gravity, is wholly inadequate to explain the observed phenomena.
The progressive changes in spectra, from the exclusive indications of the simple elements hydrogen, helium, nitrogen, possibly carbon, and the terrestrially unknown gas nebulium in the gaseous nebulæ, to the long list of familiar substances, including several chemical compounds, in the red stars, may prove to be fundamentally significant when adequately studied from the standpoint of the investigator of atomic structure.
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