POSITIONS OF ALL KINDS 



Never was the demand so great for qualiSed 

 teachers aud specialists. For ten years we_ liave 

 given our time and energy to this work. Write for 

 our free literature. State qualifications briefly. 



Co-operative Instructors' Association 



Marion - Indiana 



WATER REPTILES OF THE 

 PAST AND PRESENT 



By SAMUEL WENDELL WILLISTON 



Late Professor of Paleoniology in the 

 University of Chicago 



Professor Williston, who is widely known as a 

 student of extinct reptiles and as the author of 

 American Permian Vertebrates, which has now 

 become a standard work, presents in this new 

 volume a summary, divested as far as possible of 

 unnecessary scientific details, of our present 

 knowledge concerning the reptiles of the seas. 

 lakes, and rivers of past and present times. 



The numerous illustrations, in large part irom 

 the pen or brush of the author himself, include 

 not only living types and twenty-four restorations 

 of extinct forms, but also many figures elucidat- 

 ing the structures and habits of the animals. 



viii+2S2 pages, royal 8vo, cloth; $3.00, postpaid $3.20 



The University of Chicago Press 



Chicago ----- Illinois 



PUBLISHED PRICES 



Will be paid for 



The Journal of Geology 



We will pay the published 

 prices for any numbers of 

 the Journal of Geology. 

 Vol. I, No. I, to Vol. IX, 

 No. 6, if sent to us in 

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The University of Chicago Press 



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 Chicago, Illinois 



The Geography of the Ozark Highland of Missouri 



B> CARL ORTWIN SAUER, the University of Michigan 

 (Publications of the Geographic Society of Chicago) 



The Ozark Highland of Missouri was selected for investigation because of its 

 unusual wealth of geographic responses and because little is known concerning its con- 

 ditions and possibilities. 



The purpose of such a stud}- is twofold: to furnish an adequate explanation of 

 the conditions of life in a given area, and to contribute proved statements which will 

 aid in working out fundamental principles. 



The book is divided into three parts. The first is an outline of the envuronment. 

 Only those things which are pertinent to an understanding of the conditions under which 

 the people live are introduced. 



The second part considers the influence of environment on the settlement and develop- 

 ment of the different parts of the highland . 



The third part is a study of the economic conditions as they exist today. In conclusion 

 a forecast is offered of the lines along which the future of the region will be worked out. 



A valuable feature of the volume is the 44 figures in the text and 26 plates. 



xviii+246 pases, 8w, clo^: $3-oo, postpaid, $3.20 



The University of Chicago Press 

 Chicago, Illinois 



