An Introduction to Zoology 



By ROBERT W. HEGNER, Ph.D. / 



Instructor in Zoology in the University of Michigan 



Illustrated, iamo, $l.go 



Only a few animals belonging to the more important phyla, as viewed 

 from an evolutionary standpoint, are considered. They are, however, inten- 

 sively studied in an endeavor to teach the fundamental principles of Zoology 

 in a way that is not possible when a superficial examination of types from all 

 the phyla is made. Furthermore, morphology is not specially emphasized, but 

 is coordinated with physiology, ecology, and behavior, and serves to illustrate 

 by a comparative study the probable course of evolution. The animals are 

 not treated as inert objects for dissection, but as living organisms whose 

 activities are of fundamental importance. No arguments are necessary to 

 justify the " type course," developed with the problems of organic evolution 

 in mind, and dealing with dynamic as well as static phenomena. 



" I have read your chapter (The Crayfish and Arthropods in General) and 

 can express my satisfaction with reference to the general arrangement of the 

 matter, as well as with reference to the detail. The whole treatment is up to 

 date, taking account of the modern advancement in our knowledge of the 

 crayfishes, and, chief of all, the more important features in the natural history 

 of these animals are very properly separated from the unimportant ones. I 

 think this chapter gives the essence of what we know about crayfishes, and 

 any student might use the book advantageously. In fact, I know no other 

 text-book which gives such a wealth of information upon so few pages." — 

 Professor A. E. Orthmann, Carnegie Museum. 



"The plan is very satisfactory, and the book will be very instructive for 

 class use. I am very glad that you have chosen the bee as your insect type." 

 (Chapter XII.) — Dr. E. E. Phillips, Department of Agriculture, Washing- 

 ton, D.C. 



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