BY THE SAME AUTHOR 



An Introduction to Geology 



By WILLIAM B. SCOTT, Ph.D., LL.D. 



Blair Professor of Geology and Palseontology in Princeton University 

 New York, 1907 New Edition, completely revised, 1907 Latest Reprint, 1909 



Illustrated i2mo $2.60 



Intended to serve as an introduction to the science of Geology, 

 both for students who desire to pursue the subject exhaustively 

 and also for those who wish merely to obtain an outline of the 

 methods and principal results of the science. To the future 

 speciahst such a preliminary survey of the whole field will afford 

 the necessary orientation. To the non-specialist the graphic 

 presentation of the outlines of the subject cannot fail to prove 

 both interesting and informing. The book aims to cultivate a 

 proper scientific attitude by training the student to carefully dis- 

 tinguish between fact and inference and between observation and 

 hypothesis. He is taught to weigh his evidences carefully, and 

 while balancing probabilities suspend judgment where the data for 

 decision are insufficient. 



The new edition incorporates the results of all the important ad- 

 vances made in geological knowledge in recent years. The num- 

 ber of illustrations has been greatly increased, thus adding to the 

 admirable clearness of the text. 



Guide to the Study of Animal Ecology 



By CHARLES C. ADAMS 



Associate in Animal Ecology in the University of Illinois 



Cloth, i2mo 183 pp. $i.zj net 



This work is the outgrowth of the author's efforts during the last 

 ten years to find some consistent and satisfactory working plan for 

 handling the almost bewildering number of facts of ecological sig- 

 nificance which have been accumulating in the literature of zoology, 

 biology, and the allied sciences. An ecological point of view is de- 

 scribed more fully than other subjects, so that the student may see 

 the need of familiarity with those tests or criteria by means of 

 which he may be able to determine for himself ecological relations 

 and the validity of ecological studies. The other phases are treated 

 less fully in the discussions and with more detail bibliographically, 

 so that this may be a useful source-book. In fact, the very exten- 

 sive and up-to-date bibliography is one of the important features of 

 the entire book. 



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