ADYEETISEMENT. Ill 



XXXV. The Later Extinct Floras of North America, by John Strong Newberry; edited by 

 Arthur Hollick. 1898. 4^. xviii, 295 pp. 6S pi. Price $1.25. 



Jn prej>aration: 



XXXIV. The Glacial Gravels of Maine and their Associated Deposits, by George H. Stone. 



XXXVI. The Crystal Falls Iron-Bearing District of Michigan, by J. Morgan Clements and 

 Henry Lloyd Smyth; with a Chapter on the Sturgeon River Tongue, by William Shirley Bayley. 



XXXVIL Flora of the Lower Coal Measures of Missouri, by David White. 



XXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 



— Flora of the Laramie and Allied Formations, by Frank Hall Knowlton. 



BULLETINS. 



1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, 

 with a Geological Sketch of Buffalo Peaks, Colorado, by S. F. Emmons. 1883. 8°. 42 pp. 2 pi, 

 Price 10 cents. 



2. Gold and Silver Conversion Tables, giving the Coining Values of Troy Ounces of Fine Metal, 

 etc., computed by Albert Williams, jr. 1883. 8^. 8 pp. Price 5 cents. 



3. On the Fossil Faunas of the Upper Devonian, along the Meridian of 76*^ 30', from Tompkins 

 County, N. Y., to Bradford County, Pa., by Henry S. Williams. 1884. 8^-'. 36 pp. Price 5 cents. 



4. On Mesozoic Fossils, by Charles A. White. 1884. 8-\ 36 pp. 9 pi. Price 5 cents. 



5. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884. 8*^. 325 

 pp. Price 20 cents. 



6. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 px>. Price 5 cents, 



7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and 

 South), 1752-1881, in Geographic and Chronologic Order, by Jules Marcou and John Belknap Marcou. 



1884. 8°. 184 pp. Price 10 cents. 



8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and 

 C. R. Van Hise. 1884. 8°. 56 pp. 6 pi. Price 10 cents. 



9. A Report of Work done in the Washington Laboratory during the Fiscal Year 1883-^84. P. W. 

 Clarke, Chief Chemist; T. M. Chatard, Assistant Chemist. 1884. 8^. 40 pp. Price 5 cents. 



10. On the Cambrian Faunas of North America. Preliminary Studies, by Charles Doolittle 

 Walcott. 1884. 8^. 74 pp. 10 pi. Price 5 cents. 



11. On the Quaternary and Recent Mollusca of the Great Basin; with Description of New 

 Forms, by R. Ellsworth Call. Introduced by a Sketch of the Quaternary Lakes of the Great Basin, 

 by G. K. Gilbert. 1884. 8^. 66 pp. 6 pL Price 5 cents. 



12. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8°. 

 34 pp. 3 pi. Price 5 cents. 



13. Boundaries of the United States and of the Several States and Territories, with a Historical 

 Sketch of the Territorial Changes, by Henry Gannett. 1885. 8^. 135 pp. Price 10 cents. 



14. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent 

 Strouhal. 1885. 8^. 238 pp. Price 15 cents. 



15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 8^^. 

 33 pp. Price 5 cents. 



16. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke. 1885. 8°. 

 86 pp. 3 pi. Price 5 cents. 



17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with Notes 

 on the Geology of the District, by Arnold Hague and Joseph P. Iddings. 1885. 8^. 44 pp. Price 5 

 cents. 



18. On Marine Eocene, Fresh- Water Miocene, and other Fossil Mollusca of Western North 

 America, by Charles A. White. 1885. 8^. 26 pp. 3 pi. Price 5 cents. 



19. Notes on the Stratigraphy of California, by George P. Becker. 1885. 8^. 28 pp. Price 5 cents. 



20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W. F. Hllle- 

 brand. 1885. 8^. 114 pp. 1 pi. Price 10 cents. 



21. The Lignites oi the Great Sioux Reservation^ a Report on the Region between the Grand 

 and Moreau Rivers, Dakota, by Bailey Willis. 1885. 8^. 16 pp. 5 pi. Price 5 cents. 



22. On New Cretaceous Fossils from California, by Charles A, White. 1885. 8^. 25 pp. 5 pi. 

 Price 5 cents. 



23. Observations on the Junction between the Eastern Sandstone and the Keweenaw Series on 

 Keweenaw Point, Lake Superior, by R. D. Irving and T. 0. Chamberlin. 1885. 8^. 124 pp. 17 pi. 

 Price 15 cents, 



24. List of Marine Mollusca, comprising the Quaternary Fossils and Recent Forms from American 

 Localities between Cape Hatteras and Cape Roque, including the Bermudas, by William Healey Dall. 



1885. 8^. 336 pp. Price 25 cents. 



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

 Barnes. 1885. 8°. 85 pp. Price 10 cents. 



26. Copper Smelting, by Henry M. Howe. 1885. 8°. 107 pp. Price 10 cents. 



27. Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal Year 

 1884-'85. 1886. 8^. 80 pp. Price 10 cents. 



28. The Gabbros and Associated Hornblende Rdcks occurring in the Neighborhood of Baltimore, 

 Maryland, by George Huntington Williams. 1886. S^. 78 pp. 4 pi. Price 10 cents. 



