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Soc., vols. vi., p. 228; ix., p. 109; Astr. and Astroph., vol. xiii., p. 752; Astroph. Spettr. Brit. Astr. Pac. Astr. Not., vol. xxxviii., p. 41; Mem. Roy. Astr. Jour., No. 384; Publ. Astr. Pac. Soc., vol. vi., p. 109. Cf. Wentworth Erck's remarks in Trans. Roy. Pac. Astr. I am indebted to Dr. B. 15; Newcomb, Astr. Jour., No. 477; Backlund, Bull. Astr., t. xvii., p. 81; Parmentier, Bull. Soc.

Reg., vol. xvi., p. 265; Astr. Astr., August, 1899; Ann. Bureau des Long., 1898; Nature, vols. lii., p. 439; lvi., p. 280; lix., p. 304; lx., p. 491; Astroph. Roy. R. Dublin Soc., vol. iv., p. 481, 1891; Rosse, Proc. Roy. Trans., vol. cxliii., p. 397; Proc. Roy. Astr. "The analogy between Mars and the earth is perhaps by far the greatest in the whole solar system."

Stefan's rule of a fourth-power relation, if not actually a law of nature, is a colourable imitation of one; and its employment has afforded a practical certainty that the sun's temperature, so far as it is definable, neither exceeds 12,000° C., nor falls short of 6,500° C. Mag., vol. xxiii. Roy. Jour. of Science, vol. i. Roy. Observatory, vol. i.; Comptes Rendus, t. cxxxi., p. 734; Astroph.

The agreement in them between the positions determined, on separate grounds, for the ultra-Neptunian traveller was merely an odd coincidence; nor can we be certain, until it is seen, that we have really got into touch with it. Jour. of Science, vol. x., p. 185; Maunder, Sunday Mag., January, February, March, 1882; Campbell, Publ. Astr. Pac. Roy. Not., vol. xxvii., p. 179; Astroph. Astr. Pac.

He carried the subject somewhat farther in 1871. R. Soc., vol. xlvi., p. 231; Keeler, Astr. Nach., No. 2,927; Vogel, Astroph. Astr. Pac. Roy. Soc. Astr. Roy. Soc.

Searle, Harvard Annals, vol. xxix., p. 223; Boss, Astr. Roy. Messenger, vol. iv., p. 282; Hasselberg, Astr. Roy. Astr. Pac. Nach., Nos. 3,752, 3,753; Kapteyn, Ibid., No. 3,756; F. W. Very, Ibid., No. 3,771; and W. E. Wilson, Proc. Roy. Trans., vol. clviii., p. 540. Nach., No. 3,476; Astroph. Roy. Astr. Pac. Soc., vol. ii., p. 265; Proc. Roy.