[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.