By DAVID STARR JORDAN, Ph. D. 

 Animal Life. 



A First Book of Zoology. By David Starr Jordan, M. S., 

 M. D., Ph. D., LL. D., President of Leland Stanford Junior 

 University, and Vernon L. Kellogg, M. S., Professor of Ento- 

 mology in Leland Stanford Junior University. i zmo. Cloth, 



^1.20. 



This book gives an account in an elementary form of animal 

 ecology — that is, of the relations of animals to their surroundings. 

 It treats of animals from the standpoint of the observer, and at- 

 tempts to show the student why the present conditions and habits 

 of animal life are as we find them. It explains how the infinite 

 variety of animal form and mode' of life is the inevitable outcome 

 of the struggle for existence under changing conditions and envi- 

 ronments. Beginning with the amoeba, the simplest form of cell 

 life, it traces the evolution of animal variations and adaptations 

 through successive stages of development, until the highest speciali- 

 zation and the most complex organization are reached in man. 



The book is designed from the outset to make the student an 

 independent observer and thinker. It treats of the phase of zool- 

 ogy that appeals most strongly to the interest ot the young learner, 

 and in a way to make the study a most pleasant and profitable one. 

 It is intended to provide work for one half year in the ordinary 

 high-school course, and is to be followed by a second volume, 

 "Animal Forms," treating of structure, to complete a year's 

 study when this period is assigned to the subject. The topics as 

 treated are elastic, however, and either book can be made to cover 

 a somewhat longer or shorter time, if desired. 



The illustrations, which have been prepared expressly for the 

 work, are of an especially attractive and instructive character, and 

 add conspicuously to its distinctive features. Like the other vol- 

 umes of the Twentieth Century Text-Books, it is accompanied by 

 a brief manual containing hints to teachers, references, etc. 



D. AP PL ETON AND COMPANY, NEW YORK. 



