ADVERTISEMENT. 



23. The Junction between the Eastern Sandstone and the Keweenaw Series on Keweenaw Point, by 

 K. D.Irving and T.C.Chainberiin. 1885. 8°. —pp. 17 pi. Price — cents. 



24. List of Marino Mollusca, comprising the Quaternary Fossils and lecent forms, from American 

 localities between Cape Hatteras and Cape Eoque, including the Bermudas, by W. H. Dall. 1885. 8°. 

 336 pp. Price 25 cents. 



Numbers 1 to C of the Bulletins form Volume 1 : Numbers 7 to 14, Volume II; and Numbers 15 to 23, 

 Volume III. Volume IV is not yet complete. 

 The following are in press, viz : 



25. The Present Technical Condition of the Steel Industry of the United States, by Phinoas Barnes. 

 1885. 8°. 82 pp. Price 10 cents. 



26. Copper Smelting, by H. M. Howe. 1885. 8'=. — pp. Price — cents. 



STATISTICAL PAPERS. 



A fourth series of publications, having special reference to the mineral resources of the United 

 States, is contemplated. 



Of that series the first has been published, viz: 



Mineral Kesources of the United States 11882], by Albert Williams, jr. 1883. 8°. xvii, 813 pp. 

 Price 50 cents. 



The second volume of this series, Mineral Resources of the United States, 1883 and 1884, is in press. 



CoiTespondence relating to the publication.s of the Survey, and all remittances, which must be by 

 POSTAL NOTE OK MONEY OEDEK, should be addressed 



To THE Director of the 



United States Geological Survey, 



Washington, D. (J. 

 Wabhinoton, D. C, August 28, 1885. 



