CONTENTS 



ARTICLE I. THIRD REPORT ON A FOREST SURVEY OF ILLI- 

 NOIS. BY CLARENCE J. TELFORD. (6 Maps, 9 Pl.\tes) 

 March, 1926 1-102 



Introduction iv 



Part I. Description of tlie forests: 



Physiographic features 1 



The original forests of Illinois 2 



Outline of forest use from original to present forests 6 



Present forests of Illinois 8 



General comparison of bottomland and upland forests 8 



Forest types 9 



Bottomland types 10 



Upland types 11 



Bottomland types: 



(1) Cypress and mixed hardwood 12 



(2) Mixed hardwood bottoms of the main streams 16 



The Wabash River system 17 



The Big Muddy River system 21 



The Kaskaskia River system 23 



The Mississippi River system 24 



The Illinois River system 28 



The Rock River system 30 



(3) Mixed hardwoods of bottoms of secondary streams 30 



Upland type: 



(1) Post oak 32 



( 2 ) Scrub oak type 35 



( 3 ) Upland hardwoods 41 



Subtype (o) upland mixed hardwoods 42 



Subtype ( b ) oak-hickory 54 



Forest acreage by counties — present (1924) and original 58 



Plates I-IX 64-72 



Part II. Growth and yield studies 73 



(1) Studies of growth rates of individual trees 73 



[Table 1, showing soil type best suited to certain species] 78-79 



[Table 2, showing species best suited to specific soil type] 80 



Table 3. Average growth-rate on specific soil-types for 20-year 

 periods for 25 tree species to show soil type best suited to 

 species 81-89 



