ECOLOGICAL SURVEY OF FORESTS IN THE 

 VICINITY OF GLENCOE, ILLINOIS. 



Hazel M. Schmoll^ University of Chicago, 

 introduction. 



The ecological survey of the forests in the vicinity of 

 Glencoe is a portion of the Cook County Forestry Survey, 

 which was made under the direction of Dr. Henry C. 

 Cowles, of the University of Chicago, between October, 

 1918, and January, 1919. 



The great number of plant associations represented in 

 the vicinity of Glencoe may be attributed primarily to the 

 topographical diversity of the region. The lowland, the 

 upland, the lake bluff, and the ravines each included vary- 

 ing numbers of plant associations, which were determined, 

 not only by topographical relations, but also by the varia- 

 tion in number and combination of certain physical factors 

 which were peculiar to each area. This complex of factors 

 enabled the tracing of both the hydrarch and the xerarch 

 successions from their initial stages to their mesophytic 

 climax. 



The forest area is larger, and the forest areas that are 

 being allowed to reproduce themselves naturally are larger 

 than one would suspect in a region which is so thickly 

 settled. 



The northeast quarter section of land in Section 1 of 

 New Trier Township, which is the Forest Preserve tract, 

 that was recently purchased from W. J. Turnbull, is the 

 largest continuous forest area in this region. 



A definite terminology has been suggested by Dr. Cowles, 

 for locating specific areas within a section of a township. 

 For field study each section is divided up into sixteen forty- 

 acre plots, or "forties", these being lettered alphabetically 

 from A to P, as shown in Figure 1. Any "forty" can then 

 be referred to by letter, as for example A, which designates 

 the "forty" in the northeast corner of Section 1, New Trier 



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