JUST PUBLISHED 



FOURTH EDITION, REVISED AND ENLARGED 



ECONOMIC 

 GEOLOGY 



ECONOMIC GEOLOGY 



By Heinrjch Ries, A.M., Ph.D., Professor of 

 Economic Geology at Cornell University. 



A Textbook for Students and a 

 Reference Work for Engineers, 



Geologists and Chemists. 



i 



This new edition differs from the old in 

 the following particulars : 



1. It takes account of the progress made in the 

 subject. 



2. The Economic Geology of Canada is now in- 

 cluded. 



3. Brief accounts of important Foreign deposits 

 are also given. 



4. All statistics have been brought up-to-date. 



5. It contains many additional illustrations. 



6. The chapters on ore deposits in particular have 

 been considerably enlarged to include modern prac- 

 tice and recent discoveries. 



The arrangement and methods of treatment re- 

 main the same in this new edition, the object of the 

 book still being to give the reader a general knowl- 

 edge of the subject. By presenting first non-metallic 

 minerals, and then metallic, it leads him from the 

 simpler to the more complex phases of the subject. 



Have a Copy of this Book Sent to You for 

 Free Examination. 



If you will indicate the national technical society of which you are a mem- 

 ber, or supply a reference, this book will be sent without cash in advance. 

 At the end of ten days you are either to remit its price, or return it postpaid. 



If cash accompanies your order, you have the privilege of returning the 

 book within ten days after its receipt, when your remittance will be refunded. 



xx + 856 pages, 6 by 9, 291 figures, 75 plates. Cloth, $4.00 net. 



fourth 

 EDITION 



JOHN WILEY & SONS, Inc. 



432 FOURTH AVENUE, NEW YORK CITY 



London, CHAPMAN & HALL, Ltd. Montreal, Can., RENOUF PUB. CO. 



