[464] Astrophysical Journal, vol. 25 (1907), p. 219.

[465] Popular Astronomy, vol. 11 (1903), p. 293.

[466] Translated by W. H. Mallock, Nature, February 8, 1900, p. 352.

[467] Howard Payn, Nature, May 16, 1901, p. 56.

[468] Howard Payn, Nature, May 16, 1901, p. 56.

[469] Contributions from the Mount Wilson Solar Observatory, No. 31.

[470] Quoted by Denning in Telescopic Work for Starlight Evenings, p. 297.

[471] Astrophysical Journal, March, 1895.

[472] Outlines of Astronomy, Tenth Edition, p. 571.

[473] Astrophysical Journal, vol. 12, p. 136.