Reviews 



Testing for Metallurgical Processes. By James A. Barr. San 



Francisco: The Mining and Scientific Press; London: The 



Mining Magazine, iqio. Pp. 216. $2.00 delivered. 



This book, which is based on a course of lectures given by Mr. Barr 



at the Michigan College of Mines, is a laboratory manual for the student 



of metallurgy and for the mining engineer. The treatment differs from 



that of the textbooks on metallurgy in that the methods for testing are 



fully treated and minute details for many of the operations are given. 



It is designed not to take the place of the textbooks on metallurgy but 



to supplement them. The subjects treated include amalgamation, 



chlorination, cyaniding, concentration, smelting, calculation of lead 



and copper slags, cost data, etc. The treatment, while condensed, 



is exceptionally clear. The work should be appreciated by students, 



mining chemists, and engineers. W. H. E. 



Economic Theory with Special Reference to the United States. By 

 Heinrich Ries. 3d ed. New York: Macmillan, 1910. Pp. 



5^9- 

 The third edition of this work is revised and greatly amplified. 

 The treatment of the non-metallic minerals, which covers about 300 

 pages, is well arranged, and the data are clearly presented. The coal 

 fields of the United States are described in considerable detail and the 

 occurrences of other hydrocarbons are mentioned or briefly described. 

 Chapters are devoted to building stones, clays, limes and cements, 

 salines, gypsum, fertilizers, abrasives, minor non-metallic minerals, and 

 underground waters. The illustrations and text figures are well chosen 

 and clearly executed. The references are numerous, but are placed at 

 the end of each chapter, a practice which, though saving space, renders 

 them less accessible to the reader or student. The treatment of the 

 metals is superior to that of previous editions. Although the book is 

 intended primarily as a text, it should serve a useful purpose as a work 

 of reference to the engineer or geologist who wishes general information 

 regarding the occurrence and uses of certain minerals and the literature 

 of the subject. W. H. E. 



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