abstract: engineering 615 



GEOLOGY. — Contributions to economic geology, 1915. Part I. Metal 

 and non-metals except fuels. F. L. Ransome, et al. U. S. Geo- 

 logical Survey Bulletin 620. Pp. 361, with illustrations. 1916. 

 This bulletin is made up of short reports by a number of different 

 authors as listed herewith: 



A gold-platinum-palladium lode in ' southern Nevada. Adolph 



Knopf. 

 Gold deposits near Quartzsite, Arizona. E. L. Jones, Jr. 

 A reconnaissance in the Kofa Mountains, Arizona. E. L. Jones, Jr. 

 A reconnaissance of the Cottonwood- American Fork mining region, 



Utah. B. S. Butler aND G. F. Loughlin. 

 Notes on the fine gold of Snake River, Idaho. J. M. Hill. 

 Preliminary report on the economic geology of Gilpin County, Colo- 

 rado. E. S. Bastin and J. M. Hill. 

 The Aztec gold mine, Baldy, New Mexico. W. T. Lee. 

 Iron Ore in Cass, Marion, Morris, and Cherokee counties, Texas. 



E. F. Burchard. 



Iron-bearing deposits in Bossier, Caddo, and Webster parishes, 



Louisiana. E. F. Burchard. 

 Some cinnabar deposits in western Nevada. Adolph Knopf. 

 Quicksilver deposits of the Mazatzal Range, Arizona. F. L. Ransome. 

 Potash in certain copper and gold ores. B. S. Butler. 

 Recent alunite developments near Marysvale and Beaver, Utah. G. 



F. Loughlin. 



Nitrate deposits in southern Idaho and eastern Oregon. G. R. 



Mansfield. 

 A reconnaissance for phosphate in the Salt River Range, Wyoming. 



G. R. Mansfield. 



Cassiterite in San Diego County, California. W. T. Schaller. 



E. S. B. 



ENGINEERING.— Surface water supply of the United States, 1914. 



Part IV. St. Lawrence Basin. Nathan C. Grover, et al. U. 



S. Geological Survey Water-Supply Paper 384. Pp. 128, with 2 



illustrations. 1916. 

 This volume is one of a series of reports presenting results of meas- 

 urements of flow made on streams in the St. Lawrence River Basin 

 during the year ending September 30, 1914. It includes also a list of 

 the stream gaging stations and publications relating to water resources 

 in this Basin. 0. E. M. 



