[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.