NATURAL AREAS AND REGIONS 



479 



4. Inland sand areas 



pHavana area. Close to Havana in 

 Mason County on the eastern side of the 

 Illinois River lies an extensive sand area. 

 Several reports have been published 

 concerning the biota of this region. The 

 original vegetation was of three types, 

 namely, prairie of the level flats merging 

 into swamps, the sand prairie occupying 

 the more or less pure sand ridges and 

 dunes, and the comparatively recent 

 forest types. The first of these original 

 vegetative areas has now been mostly 

 placed under cultivation by resort to 

 drainage, but much of the two latter types 

 remain almost in their original condi- 

 tion. In this region are still to be found 

 most of the Illinois plants and animals 

 living originally in sandy situations. 

 The plant and insect life exhibits strong 

 western affinities. These areas should 

 be preserved. 



Havana, about two mi. east, Devil's 

 Hole. 



Havana, about 10 mi. northeast, 

 Devil's Neck. T. H. Prison. 



BIBLIOGRAPHY 



Baker, F. C. 



1910 The Ecology of the Skokie 

 Marsh Area, with Special 

 Reference to the Mollusca. 

 Bull. 111. State Lab. Nat. 

 Hist., Vol. VIII, Art. 4. 



Cory, C. B. 



1909 The Birds of Illinois and Wis- 

 consin. Field Mus. of Nat. 

 Hist., Publ. 13i. 



1912 The Mammals of Illinois and 



Wisconsin. Field Mus. of 

 Nat. Hist., Publ. 153. 



Cowles, H. C. 



1901 The Plant Societies of Chicago 

 and Vicinity. Bull. Geog. 

 Soc. Chicago, No. 2 (also, 

 Bot. Gaz., Vol. XXXI). 



Forbes, S. A. 



1913 The Midsummer Bird Life of 



Illinois; a Statistical Study. 



Bull. 111. State Lab. Nat. 



Hist., Vol. IX, Art. 6. 

 Forbes, S. A., and Richardson, R. E. 

 1908 The Fishes of Illinois. Final 



Report 111. State Lab. Nat. 



Hist., Vol. III. 

 1913 Studies on the Biology of the 



Upper Illinois River. Bull. 



111. State Lab. Nat. Hist., 



Vol. IX, No. 10. 

 Forbes, S. A., and Gross, A. O. 

 1921 The Orchard Birds of an Illinois 



Summer. Bull. 111. State 



Lab. Nat. Hist., Vol. XIV, 



Art. 1. 



Garman, H. 



1892 A Synopsis of the Reptiles and 



Amphibians of Illinois. Bull. 



111. State Lab. Nat. Hist., 



Vol. Ill, Art. 13. 

 Gates, F. C. 



1912 The Vegetation of the Beach 



Area in Northeastern Illinois 

 and Southeastern Wisconsin. 

 Bull. 111. State Lab. Nat. 

 Hist., Vol. IX, Art. 5. 

 Gleason, H. A. 



1910 The Vegetation of the Inland 



Sand Deposits of Illinois. 

 Bull. 111. State Lab. Nat. 

 Hist., Vol. IX, Art. 3. 

 Hall, R. C., and Ingall, O. D. 



1911 Forest Conditions in Illinois. 



Bull. 111. State Lab. Nat. 



Hist., Vol. IX, Art. 4. 

 Hart, C. H., and Gleason, H. A. 



1907 On the Biology of the Sand 



Areas of Illinois. Bull. 111. 



State Lab. Nat. Hist., Vol. 



VII, Art. 7. 

 Miller, R. A. 



1923 First Report on a Forest Survey 



of Illinois. Bull. 111. State 



Lab. Nat. Hist., Vol. XIV, 



Art. 8. 

 Mosier, J. G. 



1918 The Climate of Illinois. Bull. 



111. Agr. Exp. Station. No. 



208. 



Ridgley, D. C. 

 1921 The Geography of Illinois. 



Univ. of Chicago Press. 



Chicago. 

 Ridgway, R. 

 1889-1895 The Ornithology of 



Illinois. Final Report 111. 



State Lab. Nat. Hist., Vol. 



I and II. 

 Sampson. H. C. 



1921 An Ec9logical Survey of the 



Prairies of Illinois. Bull. 111. 



State. Lab. Nat. Hist., Vol. 



XIII, No. 16. 

 Shelford, V. E. 



1913 Animal Communities in Tem- 



perate America, as illustrated 



in the Chicago region; a study 



in animal ecology. Univ. of 



Chicago Press. Chicago. 

 Sherff, E. E. 

 1913 Vegetation of Skokie Marsh. 



Bull. 111. State Lab. Nat. 



Hist., Vol. IX, Art. 11. 

 Vestal, A. G. 



1913 An Associational Study of 



Illinois Sand Prairie. Bull. 



111. State Lab. Nat. Hist., 



Vol. X, Art. 1. 

 Wood, F. E. 

 1910 A Study of the Mammals of 



Champaign County, Illinois. 



Bull. 111. State Lab. Nat. 



Hist., Vol. VIII, Art. 5. 



