[274] Silliman's Journal, vol. xxxiv. p. 115.
[275] See Lyell's Second Visit to the U. S. vol. i. p. 69.
[276] This block was measured by Capt. B. Hall, R. N.
[277] Inundation of the Val de Bagnes, in 1818, Ed. Phil. Journ., vol. i. p. 187, from memoir of M. Escher.
[278] Lib. viii. Epist. 17.
[279] When at Tivoli, in 1829, I received this account from eye-witnesses of the event.
[280] Illustr. of Hutt. Theory, § 3, p. 147.
[281] Quadro Istorico dell' Etna, 1824.
[282] The reader will find in my Travels in North America, vol. i. ch. 2, a colored geological map and section of the Niagara district, also a bird's-eye view of the Falls and adjacent country, colored geologically, of which the first idea was suggested by the excellent original sketch given by Mr. Bakewell. I have referred more fully to these and to Mr. Hall's Report on the Geology of New York, as well as to the earlier writings of Hennepin and Kalm in the same work, and have speculated on the origin of the escarpment over which the Falls may have been originally precipitated. Vol. i. p. 32, and vol. ii. p. 93.
[283] Consid. sur les Blocs Errat. 1829.