112 THE CANADIAN ENTOMOLOGIST. 



short account of the physiographic history of the region about Lake 

 Michigan and a description of the climate and vegetation of the 

 area. A descriptive list of the localities studied is also given. 

 Chapter IV treats of the conditions of existence of aquatic animals, 

 both chemical and physical. 



The special discussion of the various animal communities 

 occupies the remainder of the book, except the last chapter. As 

 the Chicago area lies on the borderland between the eastern forest 

 region and the savanna or prairie region, a great variety of ter- 

 restrial communities are represented. Its position on Lake Michi- 

 gan also gives variety to the aquatic conditions, practically all types 

 of fresh-water communities being found within the area studied. 



Much attention is given to the origin and development of each 

 community and its subsequent fate, to the physiographic conditions 

 of the environment, and the interrelations of the various forms 

 which make up the community. At the end of last chapter are use- 

 ful reference lists of the species of animals collected at the various 

 stations representing the particular type of community discussed. 



In the concluding chapter the author returns to the general 

 subject matter and discusses suggestively the laws governing dis- 

 tribution, the relations of different communities to one another, 

 and the relations of ecology to broader geographic problems. An 

 appendix follows in which the general methods employed in the 

 study of environment are described and brief directions given for 

 the making of field observations and experiments. There is also a 

 copious bibliography and a guide map of the Chicago district, and 

 the numerous illustrations, which are of almost uniform excellence, 

 represent a large number of the animals referred to as well as their 

 habitats. 



ERRATA. 



"Green Lanes and Byways," No. 11, Vol. XLV.— On page 358, 

 in line 10, for "Cortiani" read Coritani. In line 13 — For 

 "roads" read road. On page 363 — In line 8 for "there" read 



THEN. 



Mailed March 13th, 1914. 



