[274] Popular Astronomy, vol. 15 (1907), p. 194.

[275] Popular Astronomy, vol. 15 (1907), p. 195.

[276] Bulletin, Ast. Soc. de France, February, 1903.

[277] Here χ is probably 17 Cygni, χ being the famous variable near it.

[278] Popular Astronomy, vol. 13 (1904), p. 509.

[279] Astrophysical Journal, December, 1895.

[280] The Observatory, July, 1895, p. 290.

[281] Celestial Cycle, p. 302.

[282] Nature, December 13, 1894.

[283] Histoire Celeste, p. 211.