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The Galactic System1


I. THROUGHOUT the known sidereal universe there is, among material bodies, an obvious associative tendency, which we see well illustrated in meteor showers, in satellite and planetary systems, in binary stars, and in larger stellar groups such as the Pleiades. These various products of gravitational ordering are clearly but parts of still greater systems, and one of the most fascinating of astronomical studies is to attempt to seek out the structure of an all-inclusive sidereal organisation.

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    Cf. Astroph. Jour., Proc. Nat. Acad. Sci., Pub. Ast. Soc. Pac., 1915–1921, and Scientia, 1919–1920.

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    Scientia, January 1922.

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    Harv. Circ., 229.

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    Van de Linde, Thesis, Rotterdam, 1921.

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    Scientia, March 1920.

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