WILEV BOOKS 



Published March 22nd. 



COAL. 



Its Properties, Analysis, Classification, Geology, Extraction, Uses 



and Distribution 

 By Elwood S. Moore 



Dean of the School of Mines, 

 The Pennsylvania State College. 



The only recent book on the market which treats in one handy volume and 

 in a comprehensive way everything concerning coal, including its origin, 

 geology, physical and chemical properties, geographic and geologic distribution, 

 etc. 



It is an authoritative book of reference for geologists, coal men generally, 

 scientists, chemists (particularly organic and analytical), and geographers. 



Botanists, also, will find it of value, as it takes up the question of coal flora 

 of the coal-forming periods. 



462 pages. 6 by 9. 142 figures and several folding charts. Cloth, $5.00. 



Every Geologist Should Have These Books 



Economic Geology. 



Fourth Edition. By H. RlES, Ph.D. 



856 pages. 6 by 9. 291 figures, 75 plates. $5.00. 



Handbook for Field Geologists. 



Third Edition, Thoroughly Eevised and Rearranged. 

 By the late C. W. HAYES, Ph.D., and SIDNEY PAIGE. 



166 pages. 4 by 6|. 20 figures. Flexible, $2.50. 



We are always glad to send any Wiley books on our 10 days Free Examination 

 plan (teachers allowed 60 days). 



JOHN WILEY & SONS, Inc. 



432 Fourth Avenue, New York 



AJS 4.22 



