M. L. FULLER. Occurrence of Underground Water, _ibid._. No. 114, 1905, pp. 18-40, pls. 4; Bibliographic review and index of papers relating to underground waters published by the United States Geological Survey, 1879-1904, _ibid._, No. 120, 1905, pp. 1-128. Caverns:— E. A. MARTEL. Les abimes, les eaux souterraines, les cavernes, les sources, la spélæologie. Delagrave, Paris, pp. 578. (Lavishly illustrated.) H. C. HOVEY. Celebrated American Caverns. Cincinnati, 1896, pp. 228; The Mammoth Cave of Kentucky. Louisville, 1897, pp. 111. J. W. BEEDE. Cycle of Subterranean Drainage in the Bloomington Quadrangle, Proc. Ind. Acad. Sci., 1910, pp. 1-31. Karst conditions:— J. CVIJIC. Das Karstphänomen, Geogr. Abh., vol. 5, 1893. ÉMILE CHAIX. La topographie du desert de platé (Hautes Savoie), Le Globe, vol. 34, 1895, pp. 1-44, pls. 1-16, pp. 217-330. W. V. KNEBEL. Höhlenkunde mit Berücksichtigung der Karstphänomene. Vieweg, Braunschweig, 1906, pp. 222. A. GRUND. Die Karsthydrographie, Studien aus Westbosnien, Geogr. Abh., vol. 7, No. 3, 1903, pp. 200. ÉMILE CHAIX-DU BOIS et ANDRÉ CHAIX. Contribution a l’étude des lapies en Carniole et au Steinernes Meer, Le Globe, vol. 46, 1907, pp. 17-56, pls. 26. P. ARBENZ. Die Karrenbildungen geschildert am Beispiele der Karrenfelder bei der Frutt in Kanton Obwalden (Schweiz). Deutsch. Alpenzeitung, Munich, 1909, pp. 1-9. F. KATZER. Karst und Karsthydrographie. Sarejevo, 1909, pp. 95. M. NEUMAYR. Erdgeschichte, vol. 1, pp. 500-510. E. DE MARTONNE. Traité de Géographie Physique, pp. 462-472 (excellent summaries in this and the last reference). E. A. MARTEL. The Land of the Causses, Appalachia, vol. 7, 1893, pp. 18-149, pls. 4-13. Fissure springs:— A. C. PEALE. Natural Mineral Waters of the United States, 14th Ann. Rept. U. S. Geol. Surv., Pt. ii, 1894, pp. 49-88. WILLIAM H. HOBBS. The Newark System of the Pomperaug Valley. Connecticut, 21st Ann. Rept. U. S. Geol. Surv., Pt. iii, 1901, pp. 91-93. Artesian wells:— T. C. CHAMBERLIN. Requisite and Qualifying Conditions of Artesian Wells, 5th Ann. Rept. U. S. Geol. Surv., 1885, pp. 131-173. Hot springs and geysers:— A. C. PEALE. Yellowstone Park, Thermal Springs, 12th Ann. Rept. Geol. and Geogr. Surv. Ter. (Hayden), Pt. ii, Sec. ii, pp. 63-454 (many plates and maps). W. H. WEED. Geysers, Rept. Smithson. Inst., 1891, pp. 163-178. ARNOLD HAGUE and W. H. WEED (on hot springs and geysers of Yellowstone National Park), C. R. Cong. Géol. Intern., Washington, 1891, pp. 346-363. W. H. WEED. Formation of Travertine and Siliceous Sinter by the Vegetation of Hot Springs, 9th Ann. Rept. U. S. Geol. Surv., 1889, pp. 613-676, pls. 78-87. M. NEUMAYR. Erdgeschichte, vol. 1, pp. 500-510. ARNOLD HAGUE. Soaping Geysers, Trans. Am. Inst. Min. Eng., vol. 17, 1889, pp. 546-553. JOHN TYNDALL. Heat as a Mode of Motion, New York, 1873, pp. 115-121 (artificial geyser). CHAPTER XV