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Elements of Optical Mineralogy. 



PART I — PRINCIPLES AND METHODS. 



Second Edition, Entirely Eewritten and Much Enlarged. By ALEXANDER 

 N. WlNCHELL, Doct. Univ. Paris, Professor of Mineralogy and Petrology, 

 University of Wisconsin. 



The treatment of Principles and Methods given in this new edition is 

 adapted to the microscopic study of minerals, both ill thin sections 

 and in powdered form immersed in liquids, the latter methods 

 permitting an accurate quantitative measurement of the index of refraction. 



216 pages. 6 by 9. 251 figures. Cloth, $3.50. 



Other Wiley Books for Mineralogists 



Determinative Mineralogy: With Tables for the Deter- 

 mination of Minerals by Means of Their Chemical and 

 Physical Characters. Third Eevised and Enlarged Edition. 



By J. VOLNEY LEWIS. 



298 pages. 5£ by 8. 31 double-page tables, 81 figures. 



Cloth, 



,00. 



Rocks and Rock Minerals. 



By the late LOUIS V. PlRSSON. 



414 pages. 5 by 7£. 36 half-tone plates. Cloth, $3.50. 



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