^{page 411 note 1} See life of Eduard Suess, Geol. Mag., January, 1913, pp. 1–3, and Portrait, Plate I. His obituary appeared in Geol. Mag., June, 1914, p. 288.

^{page 411 note 2} Comptes Rendus, XVII Conf. de l'Assoc. Géodés. Internat., Hamburg, 1912, pp. 427, 437.

^{page 413 note 1} Joly, J.Radioactivity and Geology, 1909, pp. 168–72.Google Scholar

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^{page 414 note 1} In his Presidential Address to the Geological Society of London in 1909, Professor W. J. Sollas (Proc. Geol. Soc., 1909, p. lxxxvii) credits H. Benndorf (Mitth. Geol. Ges. Wien, i, p. 336, 1908) with this pretty analogy, but Oldham has the precedence by just two years (cf. Quart. Journ. Geol. Soc., vol. lxii, p. 456, 1906).

^{page 414 note 2} Phil. Trans., ser. A, vol. cxciv, pp. 135–74, 1900.

^{page 414 note 3} There is more complete agreement regarding the fact that two distinct sets of waves give rise to the so-called preliminary tremors indicated by a seismographic record than about the nature of the waves. Cf. R. D. Oldham, Phil. Trans., loc. cit., and O. Fisher, Proc. Camb. Phil. Soc., vol. xii, pp. 354–61.

^{page 414 note 4} Quart. Journ. Geol. Soc., vol. lxii, pp. 456–75, 1906.

^{page 415 note 1} Ritter, A.“Untersuchungen über die Höhe der Atmosphäre und die Constitution gasformiger Weltkörper”: Wiedemann's Ann. d. Phys. und Chem., vol. v, pp. 405, 543, 1878; vol. vi, p. 135, 1879; vol. vii, p. 304, 1879; vol. viii, p. 157, 1879.CrossRefGoogle Scholar

^{page 415 note 2} On the Causes of the Phenomena of Terrestrial Magnetism, pamphlet, 1890, p. 2. The idea that the Earth's magnetism is due to the electricity generated by the friction between the shell and the core, rotating with a different motion, was suggested by Dr. Wilde in 1902 (Mem. Manch. Lit. Phil. Soc., vol. xlvi, pt. iv, p. 8, 1902). A similar suggestion based also on Halley's conception of a separately rotating inner core was made previously by Capt. (Sir) F. J. Evans in 1878 (“Remarkable Changes in the Earth's Magnetism”: Nature, vol. xviii, p. 80).

^{page 415 note 3} Quart. Journ. Geol. Soc., vol. lxiii, pp. 344–50, 1907.

^{page 416 note 1} Chamberlin, and Salisbury, , Geology, vol. ii, pp. 106–11, 1906.Google Scholar

^{page 416 note 2} Geology, vol. ii, p. 120, 1906.

^{page 417 note 1} Jahrb, N.. für Min. u.s.w., p. 537, 1907Google Scholar.

^{page 417 note 3} Evans, J., “On a possible Geological Cause of Changes in the Position of the Axis of the Earth's Crust”: Proc. Roy. Soc., vol. xv, p. 46, 1866.CrossRefGoogle Scholar

^{page 417 note 3} Evans, J., Presidential Address, Proc. Geol. Soc., 1876, p. 105.Google Scholar

^{page 417 note 4} Twisden, J. F.”On possible Displacements of the Earth's Axis of figure produced by Elevations and Depressions of her Surface”: Quart. Journ. Geol. Soc., vol. xxxiv, p. 35, 1877.Google ScholarHill, E., “On the possibility of Changes in the Earth's Axis”: Geol. Mag., 1878, pp. 262, 479.Google ScholarFisher, O., “On the possibility of Changes in the Latitude of Places on the Earth's Surface”: Geol. Mag., 1878, pp. 291, 551.Google Scholar

^{page 417 note 5} Geol. Mag., 1886, p. 304.

^{page 418 note 1} Hayden, H. H., Rec. Geol. Surv. Ind., vol. xxxvi, p. 23, 1907.Google Scholar

^{page 420 note 1} By permission of the Director-General of the Egyptian Survey Department.