[354] Quart. Journ. Geol. Soc. vol. v.; Memoirs, p. 20; and Lassaigue, Journ. Pharm. t. v. p. 468.
[355] Quart. Journ. Geol. Soc. 1848, vol. iv. p. 342.
[356] Flint's Geography, vol. i. p. 142. Lyell's Second Visit to the United States, vol. ii chaps. 28 to 34.
[357] Geograph. Descrip. of Louisiana, by W. Darby, Philadelphia, 1816, p. 102.
[358] Flint's Geography, vol. i. p. 152.
[359] Travels in North America, vol. iii. p. 361.
[360] Travels in North America, vol. iii. p. 362.
[361] "The boats are fitted," says Captain Hall, "with what is called a snag-chamber;—a partition formed of stout planks, which is calked, and made so effectually water-tight that the foremost end of the vessel is cut off as entirely from the rest of the hold as if it belonged to another boat. If the steam-vessel happen to run against a snag, and that a hole is made in her bow, under the surface, this chamber merely fills with water."—Travels in North America, vol. iii. p. 363.
[362] Darby's Louisiana, p. 33.
[363] Featherstonhaugh, Geol. Report, Washington, 1835, p. 84.