52 (HB eA UD USB ON ee BtUs Li bet aie 
collecting and preparing museum 
specimens. 
The chapter on mammal signs 
will be of considerable interest to 
both layman and mammalogist 
alike, with such interesting topics 
as, descriptions of burrows, tracks, 
trails, run-ways, droppings, tooth 
marks, and food signs. This chap- 
ter is well documented with figures, 
along with a key to the tracks of 
the common mammals, giving both 
common and scientific names, and 
also a checklist of present native 
and naturalized species. A key to 
the orders is provided, and easily 
understandable to the layman, as 
numerous figures show the key 
characteristics used in the key. 
Each species of mammals found 
within Illinois is provided with a 
full description, including measure- 
ments of body, head, and tail. 
Other topics such as, economic sta- 
tus, life history, and distribution 
within the state and North Ameri- 
ca makes this volume well worth 
being in the library of anyone in- 
terested in mammalogy, or natural 
history in general. 
Keys are provided for identifi- 
cation of the different species 
found within the state. These are 
well represented with figures 
showing the key characteristics, 
while a glossary of terms is also 
available for those not familiar 
with the new terminology. Each 
species is provided with an illus- 
tration of living animals, and dis- 
tributional maps are provided for 
those species having limited dilis- 
tribution within the state. 
The final chapter covers mam- 
mals of prehistoric times and 
mammal habitats within the fu- 
ture. The former chapter only il- 
lustrates what has already gone, 
while the latter draws attention to 
what is important in preserving our 
natural habitats. 
I would highly recommend this 
book for anyone interested in mam- 
mals, or natural history in general. 
Both Dr. Hoffmeister and Dr. Mohr 
should be highly commended in the 
outstanding contribution. 
—Harlan D. Walley 
Department of Biology 
Northern Illinois 
University, DeKalb 
THE LIMITS TO GROWTH 
by D. H. Meadows, D. L. Meadows, 
J. Randers & W. W. Behrens 
New American Library, 1972 
207 pp, $1.25 (paper) 
In 1968, a group of world scientists 
met in Rome and initiated a re- 
markably ambitious undertaking: 
the Project on the Predicament of 
Mankind. In the course of its 
work, the international team ex- 
amined five basic factors that de- 
termine, and therefore, ultimately 
limit growth — population growth, 
agricultural production, non-re- 
newable resource reserves, indus- 
trial production, and increasing 
pollution. The “Club of Rome,” 
working with the M.I.T. research 
team, employed a computer to de- 
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