[84] Nature, January 30, 1908.

[85] Nature, September 5, 1901.

[86] Ibid., July 31, 1890.

[87] Nature, October 16, 1884.

[88] Nature, February 19, 1885.

[89] Nature, January 14, 1909, p. 323.

[90] Photographic Atlas of the Moon, Annals of Harvard Observatory, vol. li. pp. 14, 15.

[91] Nature, January 18, 1906.

[92] Humboldt’s Cosmos, vol. iv. p. 481.

[93] Ibid., p. 482.