[304] Consult J. Prestwich, Water-bearing Strata around
London. 1851. (Van Voorst)

[305] Sabine, Journ. of Sci. No. xxxiii. p. 72. 1824.

[306] Haricart de Thury, "Puits Foras," p. 49.

[307] Prestwich, p. 69.

[308] Bull. de la Soc. Gaol. de France, tom. iii. p. 194.

[309] Boua Rasuma des Prog. de la Gaol. en 1832, p. 184.

[310] Seventh Rep. Brit. Ass. 1837, p. 66.

[311] H. de Thury, p. 295.

[312] Bull. de la Soc. Gaol de France, tom. i. p. 93.

[313] Bull. de la Soc. Gaol. de France, tom. ii. p. 248.

[314] See Glossary, "Tufa," "Travertin."

[315] Dr. Grosse on the Baths of San Filippo, Ed. Phil. Journ.
vol. ii p. 292.

[316] Consolations in Travel, pp. 123-125.

[317] Ibid. p. 127.

[318] C. Prevost, Essai sur la Constitution Physique du Bassin
de Vienne, p. 10.

[319] Travels across the Andes, p. 240.

[320] Annalen der Chem. 1847.

[321] Daubeny on Volcanoes, p. 222.

[322] Dr. Webster on the Hot Springs of Furnas, Ed. Phil.
Journ. vol. vi. p. 306.

[323] See a cut of the Icelandic geyser, chap. 32.

[324] M. Robert, Bullatin de la Soc. Gaol. de France, tom.
vii. p. 11.

[325] Barrow's Iceland, p. 209.

[326] See Lyell's Manual of Elementary Geology; and Dr.
Turner, Jam. Ed. New Phil. Journ. No. xxx. p. 246.

[327] L. Horner, Geol. Trans, vol. ii. p. 94.

[328] Ann. de l'Auvergne, tome i. p. 234.

[329] Ann. Scient. de l'Auvergne, tome ii. June, 1829.

[330] Edinb. New Phil. Journ. Oct. 1839.

[331] See Lyell's Travels in N. America, vol. i p. 150.

[332] Symes, Embassy to Ava, vol. ii. Geol. Trans. second
series, vol. ii. part iii. p. 388.

[333] Dr. Nugent, Geol. Trans. vol. i. p. 69.

[334] Ibid. p. 67.

[335] De la Beche, Ed. Phil. Journ. vol. ii. p. 107. Jan.
1820.

[336] De la Beche, MS.

[337] De la Beche, MS.

[338] Trans. of Lit. and Hist. Soc. of Quebec, vol. i. p. 5,
1829.

[339] Prony, see Cuvier, Disc. Prelim, p. 146.

[340] See De Beaumont, Gaologie Pratique, vol. i. p. 323,
1844.

[341] Prony, cited by Cuvier, Discours Pralimin.

[342] Brocchi, Conch. Foss. Subap. vol. i. p. 118.

[343] Archiac, Histoire des Progras de la Gaol. 1848, vol. ii.
p. 232.

[344] Brocchi, Conch. Foss. Subap. vol. i. p. 39.

[345] Ibid. vol. ii. p. 94.

[346] Mam. d'Astruc, cited by Von Hof