Abstract
II. II—CLASSIFICATION. I. FORMER CLASSIFICATIONS OF STARS. IN the various classifications of the celestial bodies which have been attempted from time to time, nebulæ and comets have been regarded as things apart from the stars; but from what I have stated in the first part of this paper, relating to the origin of the various groups of heavenly bodies, it is clear that it is not only unnecessary but unphilosophical to make such a separation; and indeed, if any such separation were needed, such a result would seem to indicate that the line of evolution is by no means so simple and clear as it really seems to be. But although it is no longer necessary to draw this distinction, it is important that I should state the various spectroscopic classifications which have been attempted in the case of the stars. With this information before us, we shall be better able to see the definite lines on which any new classification must be based to include all celestial forms.
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Suggestions on the Classification of the Various Species of Heavenly Bodies 1 . Nature 37, 606–609 (1888). https://doi.org/10.1038/037606a0
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DOI: https://doi.org/10.1038/037606a0