164 ILLINOIS STATE ACADEMY OF SCIENCE 



9. Schimper, A. F. W. 



Plant geography. Authorized translation by William R. 

 Fisher. Rev. and Ed. 1903. 



10. Miller, R. B. 



Timber soils of Illinois. Map. (unpublished.) 



11. Pax, F. 



Grundziige der phlanzenverbreitung in den Karpathen. Die 

 vegetation der Erde, von A. Engler und 0. Drude. 10: 

 193. 1908. 



EXPLANATION OF FIGURES. 



On Maps 1 to 8, townships are shown, and on Map 9 sections are 

 shown. 



Stars indicate the location of naturalized plantings, and figures 

 accompanying them show the number of shrubs growing there. 



Large dots indicate the location of cultivated plantings. 



Stippled areas inclosed by dotted lines, indicate upland timber 

 soil. 



Map 1 Stephenson county 



2 Winnebago county 



3 Boone county 



4 McHenry county 



5 Lake county 



6 Cook county 



7 DuPage county 



8 Kane county 



9 Territory surrounding Gurnee, in Lake county, showing 



the spread of the common barberry from an old hedge 

 of about 50 shrubs in the town of Gurnee. 



