Practical WILEY Books 



Third Edition, Revised and Enlarged 



THE CHEMICAL ANALYSIS 

 OF ROCKS 



By Henry S. Washington, Ph.D. 



A SELECTION of practical methods for the chemical analysis of silicate 

 rocks, and especially those of igneous origin. The new edition has been 

 thoroughly revised and considerably enlarged. The various procedures are 

 so described that they may be readily carried out by one working in a laboratory 

 that is not provided with all possible facilities, 



"Chemical Analysis of Eocks" has 271 pages, 6 by 9 inches, — its price is 

 $2.50 postpaid. 



ROCKS AND ROCK-MINERALS 



A Manual of the Elements of Petrology Without the Use of the 



Microscope. 

 By the late Louis V. Pirsson. 



A CONCISE and practical treatise which handles the rocks and rock-minerals 

 entirely from the megascopic standpoint. It meets the wants of many 

 who have to consider rocks from the scientific or practical point of view and 

 who are not in a position to use the microscopic methods. 



Field geologists, engineers, chemists, miners, etc., will find this book a 

 particularly handy work of reference. 



"Rocks and Eock-Minerals" has 414 pages, 5 by 7J inches — 74 figures, 

 36 full-page plates, $3.50 postpaid. 



Let us send you these valuable books for Free Examination 



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JOHN WILEY & SONS, Inc. 



432 Foutth Avenue, New Yoffc 



London: Chapman & Hall, Ltd. 



Canada: 

 Renouf Publishing Co. 



AJ8-3-21 



