[44] Nature, June 1, 1876.
[45] Ibid., June 8, 1876.
[46] Nature, October 17, 1895.
[47] Ibid., July 27, 1905.
[48] Celestial Cycle, p. 107.
[49] Nature, October 6, 1887.
[50] Ast. Nach., No. 4106.
[51] Copernicus, vol. ii. p. 168.
[52] Cosmos, vol. iv. p. 476, footnote.
[53] Denning, Telescopic Work for Starlight Evenings, p. 153.