X ANIMAL COMMUNITIES 



work is based, that the survey aspect of ecology is a subject for co- 

 operative investigation. Because of the complexity of the problems, it 

 has been deemed advisable to publish this work even in its present 

 preliminary and necessarily incomplete form, in order to make the 

 material accessible as soon as possible to teachers, investigators, and 

 others who are interested. 



Department of Zoology 



University of Chicago 



September 9, 1912 



PREFACE TO THE SECOND IMPRESSION 



The second impression of this book is unchanged except for the 

 correction of typographical and clerical errors. An annotated Biblio- 

 graphical Appendix has been added which will enable the reader to go 

 on with the subject. The community nomenclature has changed 

 materially in the twenty-five years which have elapsed since the book 

 was written. These changes are, however, not serious and it has been 

 possible to provide for the correction of them in a table. These cor- 

 rections were previously published in the journal Ecology. The taxo- 

 nomic nomenclature has been left in the original form. In many cases 

 the species mentioned have been separated as two or more, and the 

 natural areas on which the book is based have, to a considerable extent, 

 been destroyed so that it would not be possible to discover the relation 

 of species now recognized. The termites afford an example of this 

 kind since several species now take the place of what was considered 

 one in 191 2. Their arrangement, however, makes even a better case 

 of distribution correlated with succession than was indicated by the 

 supposed single species. 



The author is indebted to Dr. W. C. Allee and Dr. A. E. Emerson 

 of the University of Chicago for suggestions regarding the Bibliographical 

 Appendix and to the Illinois Natural History Survey for the loan of a 

 halftone block. Dr. Allee also provided notes on the stations described 

 on pages 52-56. Station 30a has an automobile road through its center 

 and is partially filled and Stations 37, 44, and 49 are no longer available 

 for study, while Station 42 is now occupied by buildings. 



Department of Zoology 



University of Illinois 



March 4, 1937 



