238 NATUEAL HISTORY BULLETIX 



1901— Haddock, William J.— The Prairies of Iowa. Fires, p. 56. 



— Thornber, John J. — The Prairie-Grass Formation in Region I. — 



Botanical Survey of Nebraska, no. Y, pp. 29-143. Ecological 



factors and plant lists. 

 1902— Adams, Charles C. — Postglacial origin and Migration of the Life 



of the Northeastern United States. — Journal of Geography, vol. 



I. Life of the prairie, p. 35, etc. 

 — Pammel, L. H. — Preliminary Notes on the Flora of Western Iowa, 



etc. — Proceedings of the Iowa Academj^ of Sciences, vol IX. pp. 



152-180. Ecologic conditions of prairies. Lists of prairie plants. 

 — Willard, Daniel E.— The Story of the Prairies, or the Landscape 



Geology of North Dakota. Portions from lakes, etc. 

 — Upham, Warren.— Review of Willard 's Story of the Prairies. Am. 



Geologist, vol. XXX. Suggests geologic origin of prairies. 

 —Williams, Walter.— The State of Missouri.— Prairie in southern 



part of state 600-800 feet above the sea; in northwestern part 



1200 feet. 

 —Gilbert, Grove K., and Brigham, Albert P.— An Introduction to 



Physical Geography. — Fires by Indians to maintain pasturage 



for buffaloes, pp. 163 and 324. 

 — Gaskill, Alfred.— Why Prairies are Treeless.— Read before the 



Society of American Foresters, February 23, 1905. Review in 



Science, vol. XXII, N. S., pp. 55-56, 1905. Fires. 

 1906— Squires, Walter S.— The passing of the Prairie Flora.— Plant 



World, vol. 9, pp. 162-164. 

 — Condra, George E. — Georgraphy of Nebraska. — Overgrazing, fires 



and occasional drouths, p. 92. 

 1907 — Parrish, Randall. — The Great Plains. — Prairie fauna, pp. 25-27. 

 1908— Baker, H. P.— Native and Planted Timber in Iowa.— Forest Ser- 

 vice Circular 154, U. S. Department of Agriculture. Drying 



winds, p. 7. Prairie fires, dry winds and less rainfall in western 



Iowa, p. 8. 

 — Cook, O, F. — Change of Yegetation on the South Texas Prairies. — 



Bureau of Plant Industry, circular no. 14, U. S. Department of 



Agriculture. Fires chiefly, also overgrazing and early Indian 



agriculture, pp. 1-5. 

 — Harvey, L. H. — Floral Succession in the Prairie-grass Formation 



of Southeastern South Dakota. — The Botanical Gazette, vol. 



XLYI. Geological pp. 84 and 297. Climatic, p. 297. Prairie 



plant lists. 

 — Channing, Edward.— Students ' History of the United States.— 



Indians burned grass to provide fields for buffaloes or bisons, 



p. 13. 

 1909 — Gleason, Henry A. — Some Unsolved Problems of the Prairies. — 



Bulletin of the Torrey Botanical Club, vol. 36, pp. 265-271. 



Low winter rainfall, p. 267. Geological causes, p. 268. 



