PAPERS ON BOTANY 247 



LITERATURE CITED 



1. Cowles, Henry C. 



The physiographic ecology of Chicago and vicinit}'. Bot. Gaz. 

 31: 73-108, 145-182, 1901. 

 la. Cowles, Henry C. 



The causes of vegetative cycles. Bot. Gaz. 51: 161-183, 1911. 



2. Clements, F. E. 



Plant succession. Cam. Inst. "Wash. Pub. 242: pp. 511, figs. 51, 

 pis. 61, 1916. 



3. Taylor, Norman. 



On the origin and present distribution of the pine-barrens of 

 New Jersey. Torreya 12: 229-242, figs. 2, 1912. 



4. Harshberger, J. "W. 



The vegetation of the New Jersey pine-barrens, pp. 327, figs. 

 284, map Philadelphia, 1916. 



5. Spalding, V. M. 



"The plains'' of Michigan, Amer. Nat. 17: 249-259, 1883. 



6. Gates, F. C. 



The vegetation of the region in the vicinity of Douglas Lake, 

 Cheboygan County, Mich. Rep. Mich. Acad. Sci. 14: 46-106, 

 pis. 17, 1913. 



7. Harper, R. M. 



The plant population of northern lower Michigan and its en- 

 vironment. Bull. Tor. Bot. Club 45: 23-42, figs. 3, 1918. 



8. Waterman, W. G. 



Ecology of northern Michigan dunes: Crystal Lake Bar region. 

 Rep. Mich. Acad. Sci. 19: 197-208, pis. 6, 1917. 



NOTES OX THE DISTEIBUTION OF THE OAKS 



AND THE BUCKEYE IX LA SALLE 



COUNTY, ILLIXOIS 



Geo. D. Fuller, University of Chicago 



Vrhile engaged in an ecological forest survey of a por- 

 tion of La Salle County, the results of which have al- 

 ready been reported,^ the writer's attention was attracted 

 by the somewhat peculiar distribution of certain trees, 

 principally species of Quercus and Aesculus. The survey 

 covers the larger proportion of that part of the county 

 lying north of the Illinois Eiver and the parts of La Salle 

 and Peru townships south of that stream. The exact 

 limits of the survey are indicated in the maps accom- 



1 Fuller, Geo. D.. and Strausbaush. P. D.. The forests of La Salle 

 County, 111.. Trans. 111. Acad. Sci. 12: 1920. 



