674 A CENTURY OF PROGRESS IN THE NATURAL SCIENCES 



of the data bearing on the reproductive behavior of wild as well as domestic 

 mammals. 



An excellent summary of the economic relations of mammals has been com- 

 piled by Henderson and Craig (1932). This book includes a wealth of data on 

 the practical aspects of mammals, particularly as related to man. The references 

 on the dietary of wild mammals are quite complete. The volume is thoroughly 

 documented. 



Probably more people have been attracted to the many fields of natural history 

 by pocket guides than from any other source. Mammal books have not kept pace 

 with allied fields in this respect. Bird guides, and good ones too, are without end; 

 we have pocket editions of books that are aids in determining plants, insects, 

 shells, and the like. A handy guide for the identification of mammals is another 

 matter. Many species have subtle differences which are hard to see, let alone 

 differentiate. Anthony's Field Book of North American Mmmnals, published in 

 1928, established the amateur's interest in mammals. Covering all of North 

 America, Anthony included descriptions of species and their races, some maps 

 indicating present known ranges, and some figures that were considered helpful 

 for identification. It is a valued contribution to mammalogy. As this report is 

 being written, yet another small book appears. A Field Guide to the Mammals, by 

 W. H. Burt and Richard Grossenheider, is a specific example of the trend in 

 American natural history. A splendid book, embellished with no end of colored 

 plates, maps, and figures of tracks, it will serve as a model for years to come. 

 Pocket books on natural history have undoubtedly brought many amateurs into 

 specific fields of study, and many of these naturalists have made substantial 

 contributions to our knowledge. 



Animals are no respecters of political boundaries. Yet the dictates of man all 

 too often indicate that faunal surveys shall be made within a single state or 

 province. Hence political lines, rather than natural boundaries, often limit the 

 reports of these faunal studies. Many state reports on mammals have appeared. 

 Among these, special mention must be made of Lyons' Mammals of Indiana, Ver- 

 non Bailey's Mammals of New Mexico and The Mammals and Life Zones of Ore- 

 gon, W. B. Davis's The Recent Mammals of Idaho, Burt's Mammals of Michigan, 

 E. R. Hall's Mammals of Nevada, Dalquest's Mamynals of Washington and the 

 comprehensive two-volume Fur-Bearing Mammals of California, by Grinnell, 

 Dixon, and Linsdale. The account of a smaller region of a state, embracing a 

 natural unit, is that of Harper (1927). This model report is one of the best local 

 studies that has yet appeared. 



An excellent summary of the development of the classification of mammals 

 from Aristotle to Weber has been recorded by Gregory (1910). Simpson (1945) 

 adequately summarizes the works that have influenced the development of mam- 

 malian classification. 



Some universities fortunately have their own publications and can thus pro- 

 vide an outlet for substantial reports. Among these several institutions, most 

 notable are the University of California Publications in Zoology, the University 

 of Michigan's JMiscellaneous Publications in Zoology and the University of Kansas 

 publications. 



The Wildlife Review, a mimeographed bulletin designed for the abstraction 

 of articles bearing on wildlife management, first appeared in September, 1935. 



