[504] Ibid., p. 89.

[505] Grant, History of Physical Astronomy, p. 107.

[506] Grant, History of Physical Astronomy, p. 113.

[507] Nature, August 11, 1898.

[508] Ibid., August 18, 1898.

[509] Ibid., October 20, 1898.

[510] The Observatory, vol. iv. (1881), p. 234.

[511] W. T. Lynn, The Observatory, July, 1909, p. 291.

[512] Quoted in The Observatory, July, 1902, p. 281.

[513] Astrophysical Journal, vol. 6, 1897, p. 304.