Geology and Natural History, 461 



II. Geology and I:Tatural History. 



1. United States Geological Survey. — The following publica- 

 tions have been received : 



Mineral Resoukces of the United States eoe the Cal- 

 endar YEAR 1901 ; by David T. Day. 973 pp.— For the second 

 time the annual mineral production exceeds $1,000,000,000. The 

 important metals except iron and zinc have decreased in output 

 and value. 1,408 ounces of platinum were produced in 1901 

 compared with 400 in 1900. Building materials, clays and abra- 

 sions show greatly increased production. For the first time in 

 the United States arsenious oxide was manufactured at Seattle, 

 and rutile was produced on a large scale — in Nelson Co., Va. 



Bulletin No. 195. — Structural details in the Green Mountain 

 Region and in Eastern New York ; by T. Nelson Dale. 10 pp., 

 4 pis., 8 figs. Some interesting examples of structures in meta- 

 morphic rocks are described and well illustrated. These details 

 have been collected since the publication of Professor Dale's 

 previous papers on this region (16th Ann. Kept., Pt. I, pp. 549- 

 570, 19th Ann. Rept., Pt. Ill, pp. 199-217). 



Bulletin No. 203. — Bibliography and Index of North Ameri- 

 can Geology, Paleontology, Petrology and Mineralogy for 1901 ; 

 by F. B. Weeks. 144 pp. 



2. Geological Survey of Kansas— Special Report on Mineral 

 Waters; by E. H. S. Bailey. Vol. vii, pp. 25-333, 38 pis.— 



Kansas is well supplied with marketable mineral waters. Mr. 

 Bailey describes and gives the analyses of some 87 springs and 

 wells separated into groups according to their mineral content. 

 He also discusses the medicinal value of the various waters and 

 the industrial uses of the brines. Dr. W. R. Crane contributes 

 a chapter (pp. 323-333) on the Geological Distribution of mineral 

 springs and wells. 



3. A Quantitative Ghemico -miner alogical Classification and 

 Nomenclature of Igneous Rocks ; by Whitman Cross, J. P. Idd- 

 iNGS, L. V. PiRSSON and H. S. Washington (Jour, of Geol, vol. 

 X, No. 6, pp. 555-690, 1902). — In this work is presented an 

 entirely new system for the classification and nomenclature of 

 igneous rocks, a result which the authors believe is to be best 

 attained by the cooperation of several workers agreeing on funda- 

 mental principles. Originally the late Prof. G. H. Williams was 

 also one- of the collaborators. 



The authors state that after many attempts to modify and use 

 existing systems this was perceived to be impossible if one should 

 evolve at the same time a comprehensive and rational one based 

 on recent investigations and knowledge. Thus through repeated 

 trials the present system was gradually worked out, and with its 

 evolution has gone hand in hand the calculation of thousands of 

 analyses by which it has been tested and its formation in part 

 controlled. It is a chemico-miner alogical system based on its 

 own principles, and as its concepts of rocks are in great part new 

 it demands a new nomenclature. 



