JOHANNES WALTHER. Das Gesetz der Wüstenbildung in Gegenwart und Vorzeit. Berlin, 1900, pp. 175, many plates. (This extremely valuable work is now out of print, but both a revised edition and an English translation are promised for 1912.) SIEGFRIED PASSARGE. Die Kalihari. Berlin, 1904, pp. 662. W. M. DAVIS. The Geographic Cycle in an Arid Climate, Jour. Geol., vol. 13, 1905, pp. 381-407. ELLSWORTH HUNTINGTON. The Pulse of Asia. New York and Boston, 1907, pp. 415. SVEN HEDIN. Scientific Results of a Journey through Central Asia, 1899-1900. Stockholm, 1904-1905, vols. 1 and 2, pp. 523 and 717, pls. 56 and 76. JOSEPH BARRELL. Relative Geological Importance of Continental, Littoral and Marine Sedimentation, Jour. Geol., vol. 14, 1906, pp. 316-356, 429-457, 524-568. E. F. GAUTIER. Études sahariennes, Ann. de Géogr., vol. 16, 1907, pp. 46-69, 117-138. The self-registering gauge of past climates:— G. K. GILBERT. Lake Bonneville, Mon. I, U. S. Geol. Surv., Chapter vi, pp. 214-318. T. F. JAMIESON. The Inland Seas and Salt Lakes of the Glacial Period, Geol. Mag. decade III, vol. 2, 1885, pp. 193-200. J. E. TALMAGE. The Great Salt Lake, Present and Past. Salt Lake City, 1900, pp. 116, plates. E. HUNTINGTON. Some Characteristics of the Glacial Period in Non-glaciated Regions, Bull. Geol. Soc. Am., vol. 18, 1907, pp. 351-388, pls. 31-39. T. C. CHAMBERLIN. The Future Habitability of the Earth, Rept. Smithson. Inst., 1910, pp. 371-389. The red and brown desert varnish:— I. C. RUSSELL. Subaërial Decay of Rocks and Origin of the Red Color of Certain Formations. Bull. 52, U. S. Geol. Surv., 1889, pp. 65, pls. 5. Erosion in the desert:— J. A. UDDEN. Erosion, Transportation, and Sedimentation performed by the Atmosphere, Jour. Geol., vol. 2, 1894, pp. 318-331. S. PASSARGE. Die pfannenförmigen Hohlformen der südafrikanischen Steppen, Pet. Mitt., vol. 57, 1911, pp. 57-61, 130-135. The dust carried out of the desert:— F. VON RICHTOFEN. China, Ergebnisse eigene Reisen und darauf gegründeten Studien, Berlin, 1877, vol. 1, pp. 56-125. E. HILGARD. The Loess of the Mississippi Valley, Am. Jour. Sci., (3), vol. 18, 1879, pp. 106-112. T. C. CHAMBERLIN and R. D. SALISBURY. Preliminary Paper on the Driftless Area of the Upper Mississippi Valley, 6th Ann. Rept. U. S. Geol. Surv., 1885, pp. 278-307. E. E. FREE. The movement of soil material by the wind, with a bibliography of eolian geology by S. C. Stuntz and E. E. Free, Bull. 68, U. S. Bureau of Soils, 1911, pp. 272, pls. 5. M. NEUMAYR. Erdgeschichte, vol. 1, pp. 510-514. E. DE MARTONNE. Géographie physique, pp. 663-668. Dunes:— VAUGHAN CORNISH. On the Formation of Sand-dunes, Geogr. Jour., vol. 9, 1897, pp. 278-309 (a most important paper). F. SOLGER and Others. Dünenbuch. Enke, Stuttgart, 1910, pp. 373. The zone of the dwindling river:—