Current Literature. 60 1 



their fuel or timber value, by the increased yield of crops due to 

 their protection. 



The Bulletin closes with recommendations for the proper 

 species in different soils in the various regions of the United 

 States. 



C. D. H. 



Forest Conditions of Illinois. By R. Clifford Hall and O. D. 

 Ingall. Bulletin, Illinois State Laboratory of Natural History, 

 Volume 9, Article 4. Urbana, Illinois. 191 1. Pp. 175-253. 



The survey leading to the present report was made by the 

 Illinois State Laboratory of Natural History in co-operation with 

 the Forest Service, and is based upon investigations conducted in 

 the winter and spring of 1910. For purposes of description and 

 authors divide the State into the Northern District and the South- 

 ern District, the dividing line being approximately the southern 

 limit of the middle Illinoisan and early Wisconsin glacial drift, 

 being roughly located by a line running from St. Louis to Shelby- 

 ville and thence east to the northeastern corner of Clark County. 

 South of this drift margin, the State was originally chiefly forest 

 with little prairie, while north of it the region was chiefly prairie 

 with little forest. 



The Southern District is divided into the Bottomland type, the 

 Upland Hill type and the Upland Plain type, while the Northern 

 District contains only two types, namely, the Bottomland type and 

 the Upland type. The composition of each type with its vari- 

 ations in different localities is given in detail, including tables 

 giving the composition percentage for each county studied. From 

 these tables it is shown that the Bottomland type of the southern 

 counties is controlled by Pin Oak, Sweet Gum, Elm and Hickory, 

 while that type in the northern counties is dominated by Elm, Soft 

 Maple, Cottonwood and Willow. The Upland Hill type is an 

 extension of the Ozark Plateau of Missouri and is dominated by 

 Black, Spanish, Red, White, Post and Chinquapin oaks, which 

 form 60% of the stand. In many places, the drier slopes and 

 upper south slopes are controlled by the Post Creek, mixed with 

 Black-jack Oak, Black Oak and Pignut Hickory. The Upland 

 Plain type is characterized by oak-hickory associations on well- 

 drained undulating country having a yellow-gray or a yellow silt 



