Geology and Mining Industry of Leadville, with atlas, by S. F. Emmons. In preparation. Geology of the Eureka Mining District, Nevada, with atlas, by Arnold Hague. In preparation. Lake Bonneville, by G. K. Gilbert. In preparation. Dinocerata: A monograph on an extinct order of Ungulates, by Prof. O. C. Marsh. In preparation. Sauropoda, by Prof. O. C. Marsh. In preparation. Stegosauria, by Prof. O. C. Marsh. In preparation. Of these Monographs, Nos. II, III, IV, V, VI, and VII are now published, viz: 11. Tertiary History of the Grand Cañon District, with atlas, by C. E. Dutton, Capt. U.S. A. 1882 40. 264 pp. 42 pl. and atlas of 26 double sheets folio. Price $10.12. III. Geology of the Comstock Lode and Washoe District, with atlas, by George F. Becker. 1882. 4. xv, 422 pp. 7 pl. and atlas of 21 sheets folio. Price $11. IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4°. xiv, 451 pp. 3 pl. Price $1.50. V. Copper-bearing Rocks of Lake Superior, by Prof. R. D. Irving. 1883. 4°. xiv, 464 pp. 29 pl. Price $-. VI. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William M. Fontaine. 1883. 1°. xix, 144 pp. 54 1. 54 pl. Price $-. VII. Silver-lead Deposits of Eureka, Nevada, by Joseph S. Curtis. 1884. 4°. xii, 200 pp. 15 pl. Price $. Nos. VIII and IX are in press and will soon appear. The others, to which numbers are not assigned, are in preparation. BULLETINS. The Bulletins of the Survey will contain such papers relating to the general purpose of its work as do not properly come under the heads of ANNUAL REPORTS or MONOGRAPHS. Each of these Bulletins will contain but one paper, and be complete in itself. They will, however, be numbered in a continuous series, and will in time be united into volumes of convenient size. To facilitate this cach Bulletin will have two paginations, one proper to itself and another which belongs to it as part of the volume. Of this series of Bulletins Nos. 1, 2, 3, 4, 5, 6, 7, and 8 are already published, viz: 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°. 40 pp. 2 pl. Price 10 cents. 2. Gold and Silver Conversion Tables, giving the Coining Value of Troy Ounces of Fine Metal, &c., by Albert Williams, jr. 1883. 8°. ii, 8 pp. Price 5 cents. 3. On the Fossil Faunas of the Upper Devonian along the Meridian of 76° 30', from Tompkins County, New York, to Bradford County, Pennsylvania, by Henry S. Williams. 1884. 8°. 36 pp. Price 5 cest 4. On Mesozoic Fossils, by Charles A. White. 1884. 80. 36 pp. 9 pl. Price 5 cents. 5. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884, 85, 825 pp Price 20 cents. 6. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. Price 5 cents. 7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and South 1752-1881, by Jules Marcou and John Belknap Marcou. 1884. 8°. 184 pp. Price 10 cents. 8. On Secondary Enlargement of Mineral Fragments in Certain Rocks, by R. D. Irving and C. B Vanhise. 1884. 8°. 56 pp. Price 10 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 Resources of the United States, by Albert Williams, jr. 1883. 8°. xvii, 813 pp. Price 50 cents. Correspondence relating to the publications of the Survey, and all remittances, which must be by postal note or money order, should be addressed to the WASHINGTON, D. C., August 30, 1884. DIRECTOR OF THE UNITED STATES GEOLOGICAL SURVEY, |