Virgil, 17, 218, 242, 262, 309 Virgo, 260 Vogel, 180 Vogt, 122 Volans, 304 Voltaire, 15 Von Hahn, 24 Vulpecula, 300 W Wallace, Dr., 212, 357 Wallis, 80 Ward, 88 Wargentin, 178 Watson, 339 Webb, 24, 25, 77, 190, 286 Weber, 183 Weinhand, 122 Wendell, 71, 103, 109 Werchojansk, 33 White spots on Jupiter's satellites, 81 White spots on Venus, 21 Whitmell, 50, 86 Wiggins, 333 Wilczyniski, 195 Williams, Stanley, 22, 277, 302 Wilsing, 155 Wilson, H. C., 137, 139 Wilson, Dr. W. E., 3, 148 Winnecke, 26, 188 Winterhalter, 351 Wolf, Dr. Max, 71, 72, 191, 211, Note p. 537 Wrangel, 240 Y Young, Prof., 4, 7, 9 Young, Miss Anne S., 79 Yunis, Ibn, 30 Z Zach, 331 Zenophon, 127 Zethas, 257 Zöllner, 27 THE END PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES. [Illustration] FOOTNOTES: [1] _Comptes Rendus_, 1903, December 7. [2] _Nature_, April 11, 1907. [3] _Astrophysical Journal_, vol. 19 (1904), p. 39. [4] _Astrophysical Journal_, vol. 21 (1905), p. 260. [5] _Knowledge_, July, 1902, p. 132. [6] _Nature_, April 30, 1903. [7] _Ibid._, May 18, 1905. [8] _Ibid._, May 18, 1905. [9] _Nature_, June 29, 1871. [10] _Nature_, October 15, 1903. [11] _The Life of the Universe_ (1909), vol. ii. p. 209. [12] _The World Machine_, p. 234. [13] Quoted in _The Observatory_, March 1908, p. 125. [14] _The Observatory_, September, 1906. [15] _Nature_, March 1, 1900. [16] _Cycle of Celestial Objects_, p. 96. [17] _Ast. Nach._ No. 3737. [18] _Observatory_, September, 1906. [19] _Nature_, November 29 and December 20, 1894. [20] _Bulletin, Ast. Soc. de France_, July, 1898. [21] _Observatory_, vol. 8 (1885), pp. 306-7. [22] _Nature_, October 30, 1902. [23] Charles Lane Poor, _The Solar System_, p. 170. [24] Smyth, _Celestial Cycle_, p. 60. [25] Denning, _Telescopic Work for Starlight Evenings_, p. 225. [26] _The Observatory_, 1894, p. 395. [27] _Ast. Nach._ 4333, quoted in _Nature_, July 1, 1909, p. 20. [28] _English Mechanic_, July 23, 1909. [29] _Nature_, December 22, 1892. [30] _Celestial Objects_, vol. i. p. 52, footnote. [31] _Ibid._, p. 54. [32] _Astronomy and Astrophysics_, 1892, p. 618. [33] _Nature_, August 7, 1879. [34] _The World of Space_, p. 56. [35] _Nature_, September 15, 1892. [36] _Observatory_, 1880, p. 574. [37] _Knowledge_, November 1, 1897, pp. 260, 261. [38] _Worlds in the Making_, p. 61. [39] _Ibid._, p. 48. [40] _Nature_, June 1, 1876. [41] _Cel. Objects_, vol. i. p. 66 (5th Edition). [42] _Celestial Objects_, vol. i. p. 65 (5th Edition). [43] _Ast. Nach._ No. 1863. [44] _Nature_, June 1, 1876. [45] _Ibid._, June 8, 1876. [46] _Nature_, October 17, 1895. [47] _Ibid._, July 27, 1905. [48] _Celestial Cycle_, p. 107. [49] _Nature_, October 6, 1887. [50] _Ast. Nach._, No. 4106. [51] _Copernicus_, vol. ii. p. 168. [52] _Cosmos_, vol. iv. p. 476, footnote.