[120] "Elements of Geology" (sixth edition), pp. 621-635.
[121] "On the Geology of Some Parts of Madeira" (Quart. Jour. Geol. Soc., x. p. 325).
[122] In a letter to Mr. Bunbury, dated November 13th, 1854 (Life, Letters, and Journals, vol. ii. p. 199). It is written from 53, Harley Street, one in the previous August bearing the superscription of 11, Harley Street, so that he appears (though there is no allusion to this in his published letters or journals) to have removed into another house in the same street. The number of this was subsequently altered.
[123] Another letter to Mr. Bunbury, dated April 30th, 1856 (ibid., p. 212).
[124] This deposit belongs to the Tertiary era (Oligocene system).
[125] Life, Letters, and Journals, ii. p. 243.
[126] The largest, called the Zwerglithurn, is about one and a half hours walk above Viesch.
[127] This had been asserted in support of the hypothesis of "craters of elevation."
[128] Colonel Lyell had retired from the army and returned to England a short time before the outbreak of the Indian Mutiny.
[129] See Professor J. W. Judd: "Volcanoes" (International Scientific Series), Fig. 22.