[38] Phillips, op. cit., [ref. 36], p. 26.

[938] J. Barrell shows how wind-borne sand may form a covering to the dry and sun-cracked surface of a lake-deposit; "Relation between climate and terrestrial deposits," Journ. Geol., 16 (1908), 280.

[39] Lake and Rastall, "Text-book of Geology" (1910), 297. Compare C. Lapworth, "Intermediate Text-book of Geology" (1899), 176, and "Geological Structure of N. W. Highlands," Geol. Surv. Scotland (1907).

[939] See A. B. Searle, "The Natural History of Clay" (1912).

[40] Hall, "The Soil," ed. 2 (1908), 34, and E. J. Russell, "Clay," Standard Cyclopedia of Modern Agriculture (1908).

[41] Reade and Holland, "Sands and Sediments," Proc. Liv. Geol. Soc. (1903-6).

[42] Andrussow, "La Mer Noire," Guide des Excursions, viime Congrès géol. internat. (1897).

[43] B. Smith, "Upper Keuper Sandstone," Geol. Mag. (1910), 302. Compare F. Cresswell, Trans. Leicester Lit. and Phil. Soc. (1910).

[44] J. Murray and A. Renard, "Deep Sea Deposits," Challenger Rep. (1891), 231.

[45] Ibid., 234.