[104] Nature, April 20, 1905.
[105] Astrophysical Journal, vol. 14 (1901), p. 258.
[106] Nature, August 22, 1907.
[107] Popular Astronomy, vol. 12 (1904), p. 679.
[108] Mars as an Abode of Life, p. 69.
[109] Ibid., p. 146.
[110] Worlds in the Making, p. 49.
[111] Worlds in the Making, p. 53.
[112] Denning, Telescopic Work for Starlight Evenings, p. 158.
[113] Ibid., p. 166.