Economic Geology 



WITH SPECIAL REFERENCE TO THE UNITED STATES 

 By HEINRICH RII.S. AM., Ph.D., 



Professor of Kionmiiic (ieol.^y at Cornell University 



Third Edition, ciilaryd and thoroughly revised, $8g pages 

 237 illnstraliims, 56 plates, tj.jo net; by mail, 



" Altogether the work is an admirable one, and we strongly commend it to 

 teachers in this country as a source of concise, accurate, and recent information 

 regarding the mineral deposits of the United States." Nature, London. 



" All general introductory geological or mineralogical matter, the reader is sup- 

 posed to have acquired. l-r ks> important matter slightly smaller type is used. 

 The style is condensed to the last degree, but not at the expense of its clearness, 

 which is French. The result is a compact and excellent book one that every 

 .broad-minded business man should have, and that deserves the wide acceptance 

 which it is finding." Science. 



"Necessarily condensed, it yet covers the ground in a thorough and authoritative 

 manner and will be used by many as the most satisfactory textbook available." 

 H. V. W. in The American Geologist. 



"The author is to-be congratulated on the broad perspective he has of his theme, 

 and the clearness of his style in presenting it. He uses no unnecessary words in his 

 treatise ; he omits none that are requisite to its complete presentation. 



" It is to the economic phase of geological study that he addresses himself. What 

 the commercial value and uses of the various deposits in the earth's crusts are, he 

 tells us in the plainest and most forcible way. He does not entirely avoid other 

 features of geology which have been presented in many other volumes, but he 

 holds himself to the one purpose of showing the industrial and commercial value 

 of clays, and coals, and marbles, and metallic ores. To all those who are interested 

 in mines, and in manufacturing what mines produce, his work cannot fail to be of 

 the highest value. 



"The book is divided into two sections: the first dealing with 'Non-Metallic 

 Minerals' such as coals, petroleum, building stones, cements, gypsum, and others; 

 and the second part treating of 'Metallic Minerals or Ores' such as iron, copper, 

 lead, zinc, aluminum, and many others. The ground covered by the author is very 

 comprehensive and thorough. 



"The illustrations and diagrams are numerous and illuminative. The author has 

 had access to plates and cuts of the United States Geological Survey in many in- 

 stances, and has made use of the statistical tables from the same source. Taken all 

 together, the volume is among the choicest of its kind, and we predict for i*. a wide 

 circulation." New England Journal of Education. 



THE MACMILLAN COMPANY 



Publisher! 64-66 Fifth Avenue New York 



