KLEMENTS OF GEOLOGY 



By ELIOT BLACKWELDER, Associate Professor of 

 Geology, University of Wisconsin, and HARLAN H. 

 BARROWS, Associate Professor of General Geology 

 and Geography, University of Chicago. 



1 1. 40 



AN introductory course in geoiugy, complete enough for 

 college classes, yet simple enough for high school pu- 

 pils. The text is explanatory, seldom merely des- 

 criptive, and the student gains a knowledge not only of the 

 salient facts in the history of the earth, but also of the methods 

 by which those facts have been determined. The style is 

 simple and direct. Few technical terms are used. The book 

 is exceedingly teachable. 



\\ The volume is divided into two parts, physical geology 

 and historical geology. It differs more or less from its prede- 

 cessors in the emphasis on different topics and in the arrange- 

 ment of its material. Factors of minor importance in the de- 

 velopment of the earth, such as earthquakes, volcanoes, and 

 geysers, are treated much more briefly than is customary. 

 This has given space for the extended discussion of matters 

 of greater significance. For the first time an adequate discus- 

 sion of the leading modern conceptions concerning the origin 

 and early development of the earth is presented in an ele- 

 mentary textbook. 



^[ The illustrations and maps, which are unusually numerous, 

 really illustrate the text and are referred to definitely in the 

 discussion. They are admirably adapted to serve as the basis 

 for classroom discussion and quizzes, and as such constitute one 

 of the most important features of the book. The questions at 

 the end of the chapters are distinctive in that the answers are 

 in general not to be found in the text. They may, how- 

 ever, be reasoned out by the student, provided he has read 

 the text with understanding. 



AMERICAN BOOK COMPANY 



