C. E. DUTTON. Tertiary History of the Grand Cañon District (with atlas), Mon. 2, U. S. Geol. Surv., 1882, pp. 264. W. M. DAVIS. The Rivers and Valleys of Pennsylvania, Nat. Geogr. Mag. vol. 1, 1889, pp. 203-219; The Triassic Formation of Connecticut, 18th Ann. Rept. U. S. Geol. Surv., Pt. ii, 1898, pp. 144-153. SIR A. GEIKIE. The Scenery of Scotland. London, 1901, pp. 1-12. I. C. RUSSELL. Rivers of North America. Putnam. New York, 1898, pp. 327. M. R. CAMPBELL. Drainage Modifications and their Interpretation, Jour. Geol., vol. 4, 1896, pp. 567-581, 657-678. HENRY GANNETT. Physiographic Types, U. S. Geol. Surv., Topographic Atlas, Folios 1-2, 1896, 1900. W. M. DAVIS. The Geographical Cycle, Geogr. Jour., vol. 14, 1899, pp. 481-504. The flood plain:— HENRY GANNETT. The Flood of April, 1897, in the Lower Mississippi, Scot. Geogr. Mag., vol. 13, 1897, pp. 419-421. W. M. DAVIS. The Development of River Meanders, Geol. Mag., Decade iv, vol. 10, 1903, pp. 145-148. W. S. TOWER. The Development of Cut-off Meanders, Bull. Am. Geogr. Soc., vol. 36, 1904, pp. 589-599. River terraces:— W. M. DAVIS. The Terraces of the Westfield River, Massachusetts, Am. Jour. Sci., vol. 14, 1902, pp. 77-94, pl. 4; River Terraces in New England, Bull. Mus. Comp. Zoöl., vol. 38, 1902, pp. 281-346. River deltas:— G. K. GILBERT. The Topographic Features of Lake Shores, 5th Ann. Rept. U. S. Geol. Surv., 1885, pp. 104-108; Lake Bonneville, Mon. I, U. S. Geol. Surv., 1890, pp. 153-167. Charts of Mississippi River Commission. G. R. CREDNER. Die Deltas, ihre Morphologie, geographische Verbreitung und Entstehungsbedingungen, Pet. Mitt. Ergh. 56, 1878, pp. 1-74, pls. 1-3. The peneplain:— W. M. DAVIS. Plains of Marine and Subaërial Denudation, Bull. Geol. Soc. Am., vol. 7, 1896, pp. 377-398; The Peneplain, Am. Geol., vol. 23, 1899, pp. 207-239. Intrenchment of meanders:— W. M. DAVIS. The Seine, the Meuse, and the Moselle, Nat. Geogr. Mag., vol. 7, 1896, pp. 189-202. Stream capture:— N. H. DARTON. Examples of Stream Robbing in the Catskill Mountains, Bull. Geol. Soc. Am., vol. 7, 1896, pp. 505-507, pl. 23. COLLIER COBB. A Recapture from a River Pirate, Science, vol. 22, 1893, p. 195. WILLIAM H. HOBBS. The Still Rivers of Western Connecticut, Bull. Geol. Soc. Am., vol. 13, 1902, pp. 17-22, pl. 1. ISAIAH BOWMAN. A Typical Case of Stream Capture in Michigan, Jour. Geol., vol. 12, 1904, pp. 326-334. CHAPTER XIV THE TRAVELS OF THE UNDERGROUND WATER