The Evolution of Worlds

by Percival Lowell

[6] Monthly notices R. A. S., March, 1897.

[7] Lowell Observatory Bulletin 6.

[8] Lowell Observatory Bulletin No. 3.

[9] Paper by the writer in the Phil. Mag., April, 1908.

[10] Adams, “Explanation of the Motion of Uranus,” 1846.

[11] Proc. Amer. Acad., Vol. I, p. 64.

[12] Proc. Amer. Acad., Vol. I, p. 65 et seq.

[13] Proc. Amer. Acad., Vol. I, p. 144.

[14] Proc. Amer. Acad., Vol. I, p. 332.

[15] Geikie, “Geology,” pages 85, 86, and 131-136.