406 W. M. DAVIS 



a desert plain, and not a normal peneplain. It is therefore exceed- 

 ingly improbable that the even-topped Bural-bas-tau, standing 

 12,000 or 13,000 feet above sea-level, gives any close measure of the 

 altitude which the whole region possessed while the great erosion that 

 it has suffered was accomplished. 



LIST OF REFERENCES 



Bornhardt. "Zur Oberflachengestallung und Geologie Deutsch-Ostafrikas." 



(Berlin, 1900.) 

 Davis, W. M. (a) "Geographic Classification, Illustrated by a Study of Plains, 



Plateaus and Their Derivatives." Proceedings of the American Association, 



Vol. XXXIII (1884), pp. 428-32. 



(b) "Geographic Methods in Geologic Investigation." National Geographical 



Magazine, Vol. I (1888), pp. 11-26. 



(c) "The Geographical Cycle." Geographical Journal (London), Vol. XIV 



(1899), pp. 481-584: 



(d) "Glacial Erosion in France, Switzerland and Norway." Proceedings of 

 the Boston Society oj Natural History, Vol. XXIX (1900), pp. 273-322. 



(e) "A Flat-topped Range in the Tian Shan." Appalachia, Vol. X (1904), 



pp. 277-84. 

 (/) "The Bearing of Physiography on Suess' Theories." American Journal 



oj Science, Vol. XIX (1905), pp. 265-73. 

 (g) "A Journey Across Turkestan." Explorations in Turkestan (Carnegie 



Institution Publications, No. 26, 1905), pp. 21-119. 

 (h) "The Complications of the Geographical Cycle." Compte Rendu, Eighth 

 International Geographic Congress (In press.). 

 Friederichsen, Petermanns Mitteilungen, Vol. XLIX, p. 136. 

 Huntington, E. "A Geologic and Physiographic Reconnaissance in Central 

 Turkestan." Explorations in Turkestan (Carnegie Institution Publica- 

 tions, No. 26, 1905), pp. 157-216. 

 Keyes, C. R. "Geological Structure of New Mexican bolson Plains." Ameri- 

 can Journal of Science, Vol. XV (1903), pp. 207-10. 

 Lapparent, A. de (a) Lecons de geographie physique (Paris, 1896). 



(b) "La question de peneplaines envisagee a la lumiere des faits geologiques." 

 Verhandlungen des VII. Internationalen Geographischen Kongr esses (1899) 

 (Berlin, 1901), Vol. II, pp. 213-20. 

 McGee, W J. "Sheetflood Erosion." Bulletin of the Geological Society of 

 America, Vol. VIII (1897), pp. 87-112. 



