[154] Denning, Telescopic Work for Starlight Evenings, p. 349.
[155] Cosmos, vol. iii. p. 75.
[156] Journal, B.A.A., June, 1896.
[157] Celestial Objects, vol. i. p. 191.
[158] Nature, May 30, 1901.
[159] Bulletin, Ast. Soc. de France, August, 1900.
[160] Astronomy and Astrophysics, 1892.
[161] Astrophysical Journal, January, 1908, p. 35.
[162] Nature, May 22, 1902.
[163] Ibid., July 9, 1903.