ORTON'S COMPARATIVE ZOOLOGY. 



COMPARATIVE ZOOLOGY, Structural and Systematic. For 

 Use in Schools and Colleges. By Jambs Orton, Ph.D., 

 Professor of Natural History in Vassar College ; Correspond- 

 ing Member of the Academy of Natural Sciences, Philadel- 

 phia, and of the Lyceum of Natural History, New York ; 

 Author of " The Andes and the Amazon," etc. 



The distinctive character of this work consists in the treat- 

 ment of the whole Animal Kingdom as a unit ; in the compara- 

 tive study of the development and variations of organs and their 

 functions, from the simplest to the most complex state ; in with- 

 holding Systematic Zoology until the Student has mastered those 

 structural afRnities upon which true classification is founded ; 

 and in being fitted for high -schools and mixed schools by its 

 language and illustrations,, yet going far enough to constitute a 

 complete grammar of the science for the undergraduate course 

 of any college. It is designed solely as a manual for instruc- 

 tion. It is not a work of reference, not a treatise. So far as a 

 book is encyclopaedic, it is unfit for a text-book. This is pre- 

 pared on the principle of " just enough, and no more." It aims 

 to present clearly, and in a somewhat new form, the established 

 facts and principles of Zoology. All theoretical and debatable 

 points, and every fact or statement, however valuable, which are 

 not absolutely necessary to a clear and adequate conception of 

 the leading principles, are omitted. 



Besides an Introduction, the work is divided into two parts. 

 Part I. treats of " Structural Zoology," and Part II. of " Sys- 

 tematic Zoology." 



This work has long been recognized as a standard text-book 

 for schools and colleges, and is used in a large number of well- 

 known institutions throughout the country. 



The price of the book is $1 80 per copy, but a sample copy 

 for inspection with a view to introduction will be forwarded, 

 postpaid, on receipt of $1 35. 



HARPER & BROTHERS, Publishers, Franklin Square, N.Y. 



It^" IVie above work wfor sale by all booksellers, or will be sent by the publishers 

 on receipt of price. If ordered sent by inail, 10 per cent, must be added 

 to cover cost of postage, unless otherwise indicated. 



