[292] Cohn. Abhandl. Schles. Gesell. Naturwiss., Heft II, 1862.
[293] Deep Sea Deposits, p. 257.
[294] C. A. Davis. Jour. of Geol., Vol. IX, 1901, p. 491.
[295] Weed. Ninth Ann. Rept. U. S. Geol. Surv., 1887–8.
[296] Reference books: Zittel’s Text-book on Paleontology, translated and edited by Eastman; Williams’ Geological Biology; Nicholson’s Manual of Paleontology.
[297] After Zittel in the main.
[298] S. W. Johnson, How Crops Feed, p. 47.
[299] Reference works: Plant Relations, Coulter, 1900,—a convenient elementary work; Schimper, Pflanzengeographie, 1898; Warming, Lehrbuch der oekologischen Pflanzengeographie, 1896; Cowles, Botanical Gazette, Vol. XXVII, 1898.
[300] One of the earliest attempts to map these and develop their significance and value is found in Vol. II, Geol. of Wis., 1873–77, Native Vegetation, pp. 176–87.
[301] Chamberlin. A Systematic Source of Evolution of Provincial Faunas, Jour. of Geol., Vol. VI, 1898, pp. 597–609.