[265] Lyell's Principles of Geology, 465.

[266] Cosmos, Vol. I. p. 250.

[267] Cosmos, Vol. I. pp. 198, 216.

[268] Cosmos, Vol. III. p. 139.

[269] Nichol's Solar System, 188. Connection of Physical Sciences, 363.

[270] Herschel's Outlines, Sec. 827.

[271] Cosmos, Vol. VIII. p. 210.

[272] Herschel's Outlines, Sec. 832.

[273] Mitchell's Planetary and Stellar Worlds, 294.

[274] Cosmos, Vol. III. p. 253.