Good Books for Mineralogists. 



A Key for the Determination of Rock-Forming 

 3Iinerals in Thin Sections. 



By ALBERT JQHANNSEN, Ph.D.. Member U. S, Geological Survey. 

 Descriptive Tables for the determination of minerals, contrary to the usual 

 practice, make up the greater portion of this book. The material has been 

 condensed as much as is consistent with clearness, and the descriptions are 

 given in as concise a form as possible. The "thumb-index" feature is of 

 great value. 



ix — 54:2 pages. 6 by 9. With 107 figures, 24 diagrams, and a folding 

 colored plate. Cloth, $5.00 net. 



Determinative 3Iineralogy ; with Tables, 



With Tables for the Determination of Minerals by Means of Their Chemical 

 and Physical Characters. Second Edition, Revised. 

 By J. VOLNEY LEWIS, 

 Professor of Geology and Mineralogy in Rutgers College. 

 This work meets the needs of the geologist and mining engineer, and is also 

 an excellent text-book for students in determinative mineralogy. Tables 

 giving the physical and chemical properties of 880 minerals are included, ar- 

 ranged in such a manner that unknown minerals may be determined quickly 

 and easily. 



vii-155 pages, 54; bv 8. 34 double-page tables, 68 figures. 

 "Cloth, SI. 50 net. 



Introduction to the Rarer Elements. 



Fourth Edition, Thoroughly Revised. 

 By PHILIP E. BROWNING, Ph.D., Assistant Professor of Chemistry. 



Kent Chemical Laboratory, Yale University. 

 A convenient handbook in the introductory study of this subject. Thorough 

 revision of the chapter on Radio-Elements, the addition of a plate showing the 

 spectra of certain gallium and indium products, and the rearrangement of the 

 section dealing with the rare earths, has brought this well-known work up to 

 date. About 200 experiments are now included. 



x-250 pages. 6 by 9. Colored spectrum chart. Cloth, $2.00 net. 



Microscopical Determination of the Opaque 

 Minerals. 



An aid to the Study of Ores. 



By JOSEPH MURDOCH, Ph.D.. Geologist, Secondary Enrichment 



Investigation. 



Gives a scheme of determination of opaque minerals embracing nearly 



every species of recognized identity that could be secured from the principal 



mineral collections of the United States. The directions given are simple and 



easily followed. 



vii -165 pages. 6 by 9. Illustrated. 



Send for Free Examination Copies TO-DAY. 



JOHN WILEY & SONS, Inc. 



Dept* B— 432 Fourth Avenue, New York 



London : Chapman & Hall, Ltd. 

 Montreal. Can. : Manila, P. I. : 



Renouf Publishing Co. Philippine Education Co. 



ajs-3-19 



