^{page 119 note 1} The theory of the cooling of the globe is not free from objections; it is necessary to admit that the earth is at the same time homogeneous, solid, and plastic. These are hypotheses which are certainly not all exact and that are admissible as approximations only. I think, however, that the formulæ may be considered as indicating the drift of the phenomena.

^{page 119 note 2} We had the good fortune of making this excursion in the company of Baron von Richthofen, the eminent Berlin professor, Professors Hughes and Sollas, and Messrs. Harker and Watte.

^{page 120 note 1} GEOL. MAG. Decade II. Vol. X. 1883, pp. 120, 133, and 137;Google Scholar and Proc. Geol. Assoc. 1884, vol. viii. p. 438.Google Scholar

^{page 122 note 1} “Nature”, 13th November, 1884.

^{page 122 note 2} Quart. Journ. Geol. Soc. 1888, p. 378.Google Scholar

^{page 124 note 1} Revue générale des Sciences. t. iii. p. 1.Google Scholar

^{page 124 note 2} Trans. Royal Soc. Edinburgh, vol. XXXV. part ii. p. 337.Google Scholar

^{page 125 note 1} This is exactly the formula which I proposed two years ago, when pointing out that the Scottish sections exhibited the material realization of this theoretical idea. Comptes Rendus Acad. Sci. 29th December, 1890, Report of M. Daubrée on the “Vaillant” prize.

^{page 126 note 1} Davison, and Darwin, , Phil. Trans. Roy. Soc. 1887, p. 281.Google Scholar