[23] Élie de Beaumont, Notice sur les systèmes de montagnes (3 vols., Paris, 1852).
[24] Vestiges of the Molten Globe (London, 1875).
[25] See J.W. Gregory, “The Plan of the Earth and its Causes,” Geog. Journal, xiii. (1899) p. 225; Lord Avebury, ibid. xv. (1900) p. 46; Marcel Bertrand, “Déformation tétraédrique de la terre et déplacement du pôle,” Comptes rendus Acad. Sci. (Paris, 1900), vol. cxxx. p. 449; and A. de Lapparent, ibid. p. 614.
[26] See A.E.H. Love, “Gravitational Stability of the Earth,” Phil. Trans. ser. A. vol. ccvii. (1907) p. 171.
[27] Rumpf, in German, the language in which this distinction was first made.
[28] Lehrbuch der Geographie (Hanover and Leipzig, 1900), Bd. i. S. 245, 249.
[29] See, for example, F.G. Hahn’s Insel-Studien (Leipzig, 1883).
[30] See Geographical Journal, xxii. (1903) pp. 191-194.
[31] The most important works on the classification of land forms are F. von Richthofen, Führer für Forschungsreisende (Berlin, 1886); G. de la Noë and E. de Margerie, Les Formes du terrain (Paris, 1888); and above all A. Penck, Morphologie der Erdoberfläche (2 vols., Stuttgart, 1894). Compare also A. de Lapparent, Leçons de géographie physique (2nd ed., Paris, 1898), and W.M. Davis, Physical Geography (Boston, 1899).
[32] “Geomorphologie als genetische Wissenschaft,” in Report of Sixth International Geog. Congress (London, 1895), p. 735 (English Abstract, p. 748).