REVIEWS 655 



the mines is hilly, and in places reaches altitudes of 1,000 feet. The rock 

 immediately adjacent to the deposits is fine-grained sediment containing 

 much siliceous cement, or hard, gray, siliceous limestone. Associated 

 with the ore-bodies are shales and breccias, and a dark igneous rock, 

 probably basalt. 



At Mine No. i, the manganese occurs as mixed oxides, largely in 

 bowlders, or segregated in lenses and sheets in varicolored clays. The 

 manganese ore may be in stringers or beds in the clay. It appears to be 

 the result of concentration and segregation. Taking all the possible 

 sources of manganese together, about 10,000 tons are available at this 

 locality. 



At Mine No. 2 the ore is also in bowlders, which lie on the surface, 

 or in clay banks; here too are sheets of manganese ore, ranging in thick- 

 ness to 15 feet. Manganese is also segregated in a zone in bedded 

 breccia, formed apparently through concentration in the residual clays 

 that weathered from the breccia. 



In general, therefore, the manganese ores appear to be residual, not 

 unlike those of the Piedmont district of southeastern United States. 



C. H. B., Jr. 



The Iron and Associated Industries of Lorraine, the Sarre District, 



Luxemburg, and Belgium. By Alpred H. Brooks and 



Morris F. LaCroix. United States Geological Survey, 



Bulletin 703, 1920. Government Printing Office, Washington, 



D.C. Pp. 131, pis. 2, figs. 12, and numerous tables, including 



statistics on Belgian iron and coal production. 



This report was prepared at Paris for the use of the American 



Commission to Negotiate Peace. It illustrates again the value of geology 



in fields normally considered foreign to the science. It calls to mind 



too the desirability of making peace-terms on the basis of such carefully 



organized facts with a view to stabilizing world-industry, rather than 



on the principle that to the victor belong the spoils. 



The purpose of the original report was to lay before the commission 

 certain facts relating to the pre-war use of Lorraine iron ore and thereby to 

 forecast the probable future of the metallurgical industry in Lorraine as 

 modified by the new national control which were under discussion when the 



report was submitted The original report was in effect an argument 



for the adoption of certain policies with reference to the iron and coal industries 



of central Europe For these reasons the reader will find that certain 



parts of the report are presented as arguments rather than as expositions. 



