[16] “Abrégé de Geologie,” De Lapparent.
[17] “Mars as the Abode of Life,” Macmillan, 1908.
[18] De Lapparent, Dana, Geikie, passim.
[19] De Lapparent.
[20] De Lapparent, Dana, Geikie, passim.
[21] Suess, “The Face of the Earth,” p. 213.
[22] Dana. “Geology.”
[23] Dana, Geikie, De Lapparent.
[24] Cf. Grant Allen.
Transcriber’s Notes: