94 REPOET OF THE yECRETAEY. 



III. Geology of the Comstock Lode iiiid tlic Wasboe District, with atlas, by Georgo 

 F.Becker. 1882. 4°. xv, 422, pp. 7 pi. aud atlas of 21 sbcets folio. Price $11. 



IV. Comstock Miuiug and Miners, by Eliot Lord. 1883. 4°. xiv, 451 pp. 3 pi. 

 Price $1.50. 



V. Copper-beariug Rocks of Lake Superior, by Roland D. Irving. 1883. 4°. xvi, 

 464 pp. 29 pi. Price $1.85. 



VI. Contribntious to the knowledge of the Older Mesozoic Flora of Virginia, by W. 

 M.Fontaine. 1883. 4°. xi, 144 pp. 54 1. 54 pi. I'rice $1.05. 



VII. Silver-lead Deposits of Eureka, Nevada, by Joiicph S. Curtis. 1884. 4°. xiii, 

 200 pp. 16 pi. Price $1.20. 



The following are in press, viz : 



VIII. Paleontology of the Eureka DistrCt, by Charles D. Waluott. 1884. 4'-"'. xiii, 

 285 pp. 24 1. 24 pi. Price $1.10. 



IX. BrachioiJoda and Lamellibranchiata of the Karifan Clays and Greensand Marls 

 of New Jersey, by Robert P. Whitfield. 1-S^4. 4". ix, 338 i>p. 35 pi. 



X. Dinocerata. A Monograi)h of an Extinct Order of Gigantic Mammals, by 0th- 

 niel Charles Marsh. 1884. 4"^. , pp. pi. 



The following are in preparation, viz : 



I. The Precious Metals, by Clarence King. 



Geology and Mining Industry of Leadville, with atlas, by S. F. Emmons. 



Geology of the Eureka Mining District, Nevada, with atlas, by Arnold Hague. 



Lake Bonneville, by G. K. Gilbert. 



Sauropoda, by Prof. O. C. Marsh. 



Stegosauria, by Prof. O. C. Marsh. 



BULLETINS. 



The Bulletins of the Survey will contain such papers relating to the general pur- 

 pose of its work as do not properly come under the heads of Annual Reports or Mono- 

 graphs. 



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, each Bulletin will have two pagina- 

 tions, one proper to itself, and one which belongs to it as part of the volume. 



Of this series of Bulletins, Nos. 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 are already published. 



1. On Hypersthene-Andesite and on Tricliuic Pyroxene in Augitic Rocks, by Whit- 

 man Cro.s8, 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 value of Troy ounces of 

 fine metal, &c., by Albert Williams, jr. 1883. 8°. ii, 8 jip. Price 5 cents. 



3. On the Fossil P'annas of the Upper Devoninn 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 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 pp. 



Price 5 cents. . This number completes Vol. I of the Bulletins, and contains 



the title-page, table of contents, and list of illustrations for the whole volume. 



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 Enlargements of Mineral Fragments in certain Rocks, by R. D. 

 Irving and C. R. Vanhise. 1884. 8°. 56 pp. Price 10 tents. 



9. A Report of Work done in the Washington Laboratory during the fiscal year 



