Principles of Geology / or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology

by Sir Charles Lyell

[244] Ibid. pp. 761 and 773.

[245] Phil. Mag. and Annals, No. 58. New Series, p. 242.

[246] Système de Montagnes, 1852, p. 429.

[247] Phil. Mag. and Annals, No. 58. New series, p. 243.

[248] Système de Montagnes, 1852, p. 429.

[249] For page, see Index, "Hopkins."

[250] Art. Système de Montagnes, p. 775.

[251] M. E de Beaumont in his later inquiries (Comptes rendus, Sept. 1850, and Systèmes des Montagnes) has come to the conclusion, that the principal mountain ranges, if prolonged, would intersect each other at certain angles, so as to produce a regular geometric arrangement, which he calls "a pentagonal network." This theory has been ably discussed and controverted by Mr. Hopkins, in his Anniversary Address as President of the Geol. Soc., Feb. 1853.

[252] Darwin's Geology of South America, p. 248. London, 1846.

[253] Système de Montagnes, p. 748.