[364] Ast. Nach., No. 3476.
[365] Astronomische Nachrichten, No. 4213.
[366] Astrophysical Journal, vol. 9, p. 149.
[367] Cape Observations, p. 61.
[368] Ibid., p. 85.
[369] Cape Observations, p. 98.
[370] Transactions, Royal Dublin Society, vol. 2.
[371] Ast. Nach., 3628, quoted in The Observatory, April, 1900.
[372] Nature, April 8, 1909.
[373] Problems in Astrophysics, p. 477.