436 
Aid in Wildlife Restoration Act program, 
and was approved by the Bureau of Bio- 
logical Survey of the U. 5. Department 
of Agriculture inv Viay, 1939)" Vhe n= 
vestigation was initiated on June 1, 1939, 
and completed on June 30, 1940. 
PROJECT ADMINISTRATION 
Supervision of Project 1-R, which was 
of the survey type of research, was assigned 
to the Illinois Natural History Survey 
by the Illinois State Department of Con- 
servation. Dr. T. H. Frison, Chief, rep- 
resenting the Natural History Survey, and 
Mr. Anton J. Tomasek, representing the 
Department of Conservation, directed the 
project from the fiscal and administrative 
standpoints. Dr. Carl O. Mohr and the 
junior author, both of the Natural History 
Survey, jointly supervised the field work; 
and all project papers, reports and tech- 
nical details were handled directly or 
under the immediate supervison of the 
latter. 
The senior author was selected as leader 
of the project and served in this capacity 
until its termination. He was responsible 
for the field survey, a summarization of 
data and a preliminary draft of the main 
body of the paper. 
ACKNOWLEDGMENTS 
The writers make grateful acknowledg- 
ment to the following for assistance. 
The Fish and Wildlife Service of the 
U.S. Department of the Interior (during 
the first part of this study the Bureau of 
Biological Survey of the U. S. Depart- 
ment of Agriculture) gave many helpful 
suggestions and much encouragement, of- 
ficially extended through Mr. Albert M. 
Day and Mr. M. O. Steen. 
Several members of the Illinois Natural 
History Survey staff aided materially. Dr. 
David H. Thompson gave much assistance 
with sampling and _ statistical problems 
after having directed two previous studies, 
some data from which are included in the 
Mohr* report. Dr. Ralph E. Yeatter, 
Mr. Arthur S. Hawkins and Mr. Frank 
C. Bellrose, Jr., aided in various ways. 
Illinois State Department of Conserva- 
tion game inspectors gave the project 
*Throughout this paper, the term Mohr report refers to 
“Tjlinois Furbearer Distribution and Income,’ by Carl O. 
Mohr, published with this paper as Article 7. 
ILLINoIs NATURAL History SURVEY BULLETIN 
Vol. 22; Arts 6 
leader assistance which unquestionably in- 
creased the reliability of field data taken. 
The following were especially helpful: 
Sam Parr, Willis Spencer, Fred Ireland, 
William Pippin, Charles Dewis, Gene 
Fullenwider and Robert Graham. 
Dr. R. S. Smith of the University of 
Illinois College of Agriculture and Agri-— 
cultural Experiment Station was of great 
assistance in making the division of the 
state into fur survey regions. Mr. Doug- 
las E. Wade, now of Dartmouth College, 
offered suggestions on field technique. 
Dr. Herbert H. Ross, Dr. George W. 
Bennett, Dr. Carl O. Mohr, Mr. Robert 
E. Hesselschwerdt and Mr. James S. 
Ayars, members of the Illinois Natural 
History Survey Staff, took most of the 
habitat photographs. Dr. Charles F. 
Hottes, Professor of Plant Physiology, 
Emeritus, University of Illinois, kindly 
permitted use of the photograph represent- 
ed by fig. 22. 
Several leading fur companies and many 
Illinois fur buyers supplied valuable infor- 
mation. he writers wish particularly to 
thank the F. C. Taylor Fur Company, 
Hill Bros. Fur Company and the Abra- 
ham Fur Company of St. Louis, Mo., and 
Sears, Roebuck and Company of Chicago, 
all of which receive a considerable volume 
of Illinois raw furs. Mr. V. E. Hazel 
of Sears, Roebuck and Company was espe- 
cially cooperative. 
Finally, the writers’ thanks are due to 
a great many individual hunters, trappers 
and others whose interest and cooperation 
have contributed to the completeness of 
this report. 
REVIEW OF LITERATURE 
There is relatively little published in- 
formation on Illinois fur species. Kenni- 
cott (1857, 1858, 1859), in accounts of 
most fur animals of the state, including 
fisher and marten, gave early reports on 
the economics of these animals. He recog- 
nized the fur value and the rodent-destroy- 
ing proclivities of fur animals, but for the 
most part his discussion is concerned with 
habits and predatory relationships. Cory 
(1912) supplied detailed accounts of the 
habits and known occurrence of I\linois 
mammals, but only a most general account 
of their economic importance. Forbes 
(1912) recognized that the fur resource 
