The Student's Elements of Geology

by Sir Charles Lyell

[4] Dr. Daubeny on Volcanoes, 2nd ed., pp. 14, 15.

[5] G. Hose, Ann. des Mines, tome viii, p. 32.

[6] MacCulloch Sys. of Geol., vol. ii, p. 137.

[7] Fortis, Mém. sur l’Hist. Nat. de l’Italie, tome 1., p. 233, plate 7.

[8] Delesse, sur les Roches Globuleuses, Mém. de la Soc. Géol. de France, 2 sér., tome iv.

[9] Scrope, Geol. Trans., 2nd series, vol. ii, p. 205.

[10] Cambridge Transactions, vol. i, p. 402.

[11] Ibid., vol. i, p. 410.

[12] Ibid., vol. ii, p. 175.

[13] Dr. Berger, Geol. Trans., 1st series, vol. iii, p. 172.