ADVERTISEMENTS. 



The Lixiviation of Silver Ores 



WITH 



Hyposulphite Solutions. 



BY CARL A. STETEFELDT. 



In Cloth, Illustrated. Price, $5,00. 



Notices and Opinions. 



" We can unreservedly recommend this work." Mexican Financier. 



PROF. SAFFORD, of the Vanderbilt University, writes: "Mr. Stetefeldt has 

 given us a most useful work and one well up with the times." 



PROF. COMSTOCK, of the University of Illinois, says : "There is a crying need 

 of more works like it upon cognate subjects." 



" It is in every respect a model of what such a book should be and is another 

 illustration of German thoroughness." Journal of Analytical Chemistry. 



PROF. EGLESTON, of the Columbia College School of Mines, writes : " The 

 book is a very valuable contribution to our knowledge of teaching, and I shall take 

 great pleasure in recommending it to students, metallurgists and others." 



" It is particularly valuable for its descriptions of the chemistry of the process, 

 in which the older works are woefully deficient. It gives all the facts, apparently 

 which one engaged in milling ore by the process should know." Mining Industry. 



PROF. HOFMAN, of the Dakota School of Mines, writes : " I have no hesita- 

 tion in saying that the ' Lixiviation of Silver Ores ' is the best existing work upon 

 the subject, and will, undoubtedly become THE text-book for specialists in this in- 

 interesting field." 



PROF. SHARPLESS, of the Houghton Mining School, writes : "One who has 

 occasion to read up the recent advances of lixiviation processes will appreciate the 

 work which has been done by the author in compiling and in original research, and 

 the profession should extend its thanks to Mr. Stetefeldt for his successful effort 

 ' to fill up a gap in metallurgical literature.' " 



PROF. BRUNO KERL, in a review of this book which he prepared for the Berg- und 

 Huettenmaennische Zeitung, of Berlin, says: "All the defects of the old process 

 have been overcome by the Russell process as described by Mr. Stetefeldt in his 

 book, which fills a real gap in metallurgical literature. ... Its translation 

 into German would be a very desirable addition to our literature." 



JOHN HEARD, JR., Mining Engineer, writes: 



"This treatise is the most valuable indeed the only valuable one on lixivia- 

 tion. The amount of careful, intelligent, original and compiled research is enor- 

 mous ; the tables and drawings must be invaluable and, indeed, indispensable to any 

 manager of a lixiviation plant, and the figures there recorded are more convincing 

 arguments as to the value and range of lixiviation as a method of extracting silver 

 from certain ores than the author's dogmatic deductions. 



SCIENTIFIC PUBLISHING COMPANY, 



27 PARK PLACE, NEW YORK. 



