Vili ANIMAL COMMUNITIES 
Mr. S. S. Visher and Mr. Ralph Chaney contributed most of the habitat data 
on birds. Dr. R. M. Strong verified those included here which were 
also compared with Butler’s account (108). T. C. Stephens supplied the 
photographs of nests. 
Dr. P. G. Heinemann, University of Chicago, Bacteria. 
Dr. Susan P. Nichols, Oberlin College, Algae. 
Mrs. Elva Class and Mr. M. M. Wells of the University of Chicago, and Dr. 
W. C. Allee, of the University of Illinois, Gas analysis. 
Mariner and Hoskins, Commercial Chemists, Analysis of Water. 
The original records upon which the work is largely based could not 
all be presented. ‘Those placed at the end of the chapters are believed 
to be representative, in that they include some characteristic animals, 
some which are numerous but occur elsewhere also, and some of wide dis- 
tribution. The records in the text are also largely original, except in the 
case of mammals, the habitat locations of which are based upon literature. 
Mr. W. H. Osgood of the Field Museum has assisted in the editing of the 
data on mammals. Original records in this group are especially indicated. 
Data on the nesting habits of birds have likewise depended upon compila- 
tion, though the locality records are those of the persons mentioned. 
Mr. W. S. Stahl, assistant United States attorney, edited the paragraphs 
on the legal restrictions upon field study and collection of animals. 
The matter of scientific names is one presenting unusual difficulties 
because of the scattered and incomplete character of catalogues. The 
work of identification having occupied several years, changes in nomen- 
clature may have led to some confusion and duplication of records under 
different names. The matter of correcting spelling is unusually difficult 
because of numerous works which it is necessary to consult for verification 
in dealing with representatives of nearly all groups from Protozoa to 
mammals. The specialists on the different groups have been very kind 
in answering any question, but the final responsibility rests with the 
author. In the main the nomenclature in the following works has 
been followed (numbers refer to Bibliography at the end of this work): 
mammals, 21; birds, 108; reptiles, 157, 157a; Amphibia, 139 and 152; 
fishes, 79; flies, Aldrich’s (’00) Catalogue (N.A.); beetles, 156 and 
Samuel Henshaw’s (’85) checklist; Hemiptera (Heteroptera), Bank’s (11) 
Catalogue; aquatic insects, 95 and 96; ants, 54; insects not included 
in the special lists, 177; Hymenoptera not in 177, E. T. Cresson’s (’87) 
Synopsis; spiders, 159; Phalangidae and land mites, 172 and 184; water- 
mites, 149; myriopods, 183; mollusks, F. C. Baker’s (’06) Catalogue 
for Illinois; leeches, 91a; crayfishes, 101, 1o1a; amphipods, 102; isopods, 
