232 NATURAL HISTORY BULLETIN 



print from Western Monthly Magazine, February, 1836.) In 

 Swamps. Fires assisted. 



1839 — Carpenter, W. M. — Miscellaneous Notices in Opelousas, etc. — Am. 

 Journal of Science and Arts, 1st series, vol. XXXV, pp. 344-6. 

 Extremes of moisture. 



1844 — Phillips, E. — Report on the timber, soil, and productiveness of the 

 Mineral District. — In Owen 's Report of a Geological Explora- 

 tion of part of Iowa, Wisconsin, and Illinois. — Wind and fires, 

 p. 190. 



1847 — Dawson, John W. — On the Destruction and Partial Reproduction 

 of Forests in British North America. — Am. Journal of Science 

 and Arts, 2nd series, vol. IV, pp. 161-170. Effects of fires, and 

 restoration of forest. 



1849 — Dana, James D. — Observations on some points in the Physical 

 Geography of Oregon and Upper California. — Am. Journal of 

 Science and Arts, 2nd series, vol. VII. Dry summers, tempera- 

 ture, ocean winds, topography, pp. 385-389. 



1852 — Owen, D. D. — Report of a Geological Survey of Wisconsin, Iowa 

 and Minnesota. Geological, pp. xxxv and xxxvii. 



1856 — ^Desor, E. — Bulletin, de la Societe Sciences Naturelle de Neuchatel, 

 December, 1856. — Deep water, (Quoted by Lesquereaux in Geol- 

 ogical Survey of Illinois, vol. I, p. 244.) 

 — Vaughn, Daniel. — On the Origin of Prairies. Cincinnatus, June, 

 1856. (Quoted by Newberry, Geological Survey of Ohio, vol. I, 

 p. 31). Mainly rainfall. 



1857 — Lesquereaux, Leo. — Bulletin de la Societe des Sciences Naturelle 

 de Neuchatel, for 1856. (Quoted by Lesquereaux in the Illinois 

 and Arkansas Geological Reports cited in this list.) Water. 

 — Gray, Asa. — Statistics of the Flora of the Northern United States. 

 — Am. Journal of Science and Arts, 2nd series, vol. XXIII. 

 Prairie plants, p. 397. 



1858 — Whitney, J. D. — Hall's Geological Survey of Iowa, vol. I, part 1. 

 Prairies, pp. 14-34. Fine soil, not fire. 

 — Foster, J. W. — Report to the Illinois Central Railroad Company. 

 This was later (1869) expanded in "The Mississippi Valley." 



1859 — Cooper, Dr. J. G. — On the Distribution of the Forests and Trees of 

 North America. An. Report" Smithsonian Institution for 1858. 

 Rainfall, pp. 275-280. 



1860 — Lesquereaux, Leo. — Prairies of Arkansas. — In Owen 's Second Re- 

 port of a Geological Reconnoissance of Arkansas, pp. 323-326. 

 Marshes. Causes various. 

 — Newberry, J. S. — Catalogue of the Flowering Plants and Ferns of 

 Ohio. — Ohio Agricultural Report for 1859. Footnote, pp. 8, 9. 

 Deficiency of moisture. 

 Vaughn, Daniel. — On the Growth of Trees in Continental and Insular 

 Climates. — Report of the British Association for 1860. Quoted 



