PAPERS ON BOTAISTY 227 



A. LITERATURE 



There lias been little study made of the forests of this 

 region. Hall and Ingall (7) describes the forests of the 

 northern part of the state, but they made a detailed study 

 of only the uplands of Pike, Calhoun and Jo Daviess 

 counties and the bottomlands along the Mississippi and 

 Illinois Eivers. Cowles (5) has described the vegetation 

 of the Chicago region dividing it into three general types 

 depending upon soil and topographic conditions: the 

 mesophytic upland forest on morainic clay, the hydro- 

 ph^i:ic lakes and swamps and mesophytic prairies of the 

 Chicago plain and the xerophytic forests of the dunes 

 and ridges. The jolant associations found in the area 

 studied come under these general tyi^es and the lists of 

 characteristic trees and undergrowth given by Cowles 

 are very valuable. 



A similar ecological study has been made of the north- 

 ern part of Glencoe by Hazel M. Schmoll (11), but her 

 section lies on the morainic upland and does not include 

 any of the Cldcago plain and the ridges, which compose 

 the greater part of the Evanston-Winnetka area. Ul- 

 rich's study of conditions in the McLeish ravine at Glen- 

 coe (13) and Sherff's of the vegetation of the Skokie 

 Marsh (12) also deal with conditions not found in this 

 area. 



The only articles which deal directly with the vegeta- 

 tion of this region are those by residents of Evanston 

 and are very enlightening as to the former conditions 

 there. C. B. Atwell (1) in an address before the Evans- 

 ton Historical Society, described the forests on and be- 

 tween the ridges of Evanston, comparing the different 

 tji^es. Otherwise there has been no investigation made. 



B. METHODS 



The general limits of the area to be covered in this 

 study were chosen to include the ends of the beaches of 

 Lake Chicago and the land between them. The lines 

 were rather arbitrarily drawn, but an investigation of 

 the forests bevond the borders of the area showed that 



