[33] On this subject see J. Geikie, Earth Sculpture (London, 1898); J.E. Marr, The Scientific Study of Scenery (London, 1900); Sir A. Geikie, The Scenery and Geology of Scotland (London, 2nd ed., 1887); Lord Avebury (Sir J. Lubbock), The Scenery of Switzerland (London, 1896) and The Scenery of England (London, 1902).
[34] Some geographers distinguish a mountain from a hill by origin; thus Professor Seeley says “a mountain implies elevation and a hill implies denudation, but the external forms of both are often identical.” Report VI. Int. Geog. Congress (London, 1895), p. 751.
[35] “Mountains,” in Scot. Geog. Mag. ii. (1896) p. 145.
[36] Führer für Forschungsreisende, pp. 652-685.
[37] See, for a summary of river-action, A. Phillipson, Studien über Wasserscheiden (Leipzig, 1886); also I.C. Russell, River Development, (London, 1898) (published as The Rivers of North America, New York, 1898).
[38] W.M. Davis, “The Geographical Cycle,” Geog. Journ. xiv. (1899) p. 484.
[39] A. Penck, “Potamology as a Branch of Physical Geography,” Geog. Journ. x. (1897) p. 619.
[40] See, for instance, E. Wisotzki, Hauptfluss und Nebenfluss (Stettin, 1889). For practical studies see official reports on the Mississippi, Rhine, Seine, Elbe and other great rivers.
[41] F.A. Forel, Handbuch der Seenkunde: allgemeine Limnologie (Stuttgart, 1901); F.A. Forel, “La Limnologie, branche de la géographie,” Report VI. Int. Geog. Congress (London, 1895), p. 593; also Le Léman (2 vols., Lausanne, 1892, 1894); H. Lullies, “Studien über Seen,” Jubiläumsschrift der Albertus-Universität (Königsberg, 1894); and G.R. Credner, “Die Reliktenseen,” Petermanns Mitteilungen, Ergänzungshefte 86 and 89 (Gotha., 1887, 1888).
[42] J. Murray, “Drainage Areas of the Continents,” Scot. Geog. Mag. ii. (1886) p. 548.