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ILLINOIS STATE ACADEMY OF SCIENCE 



LITERATURE CITED. 



1. Hopkins, Cyril G. et al. La Salle County soils. Soil Report No. 5, 



Univ. 111. Agri. Exper. Station, pp. 45. Maps. 1913 



2. Sampson, Homer C. An ecological study of the prairie vegetation 



of Illinois. Bull. 111. State Nat. Hist. Survey 13: 523-577. Pis. 

 48-77. Figs. 1-9. 1921. 



3. Fuller, Geo. D. and Strausbaugh, P. D. On the forests of La Salle 



County, Illinois. Trans. 111. Acad. Sci.. 12: 246-272. Maps 1919. 



4. Fuller, Geo. D. Soil as a limiting factor of the forests of La Salle 



County, Illinois. Trans. 111. Acad. Sci. 12: 99-102. 1919. 



5. Fuller, Geo. D. An edaphic limit to forests in the prairie region of 



Illinois. Ecology 4: 135-140. Fig. 3. 1923. 



6. Jennings, O. E. Have the streams of Long Island been deflected 



by the earth's rotation? Science 55: 191. 1922. 





