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ADVERTISEMENT.

The following is in press, viz
Xn. Geology and Mining Industry of Leadville, with atlas, by S. F. Emmons. 1886. 4°. ttHt^
770 pp. 45 pi. and atlas of 35 sheets folio.
The following are in preparation, viz
I. The Precious Metals, by Clarence King.
— Gasteropoda of the New Jersey Cretaceous and Eocene Marls, by Ri P. Whitfield.
— Geology of the Eureka lifciing District, Nevada, with atlas, by Arnold Hague.
— Lake Bonneville, by G.. K. Gilbert.
— Sauropoda, by Prof. 0. C. Marsh.
— Stegosauria, by Prof. O. C. Marsh.
— Brontotheridae, by Prof O. C. Marsh.
— Geology of the Quicksilver Deposits of the Pacific Slope, with atlas, by Geprge ¥. Becker.
— The Penokee-Gogebio Iron-Bearing Series of North "Wisconsin and Michigan, by Eoland D. Irving.
— Younger Mesozoic Flora of Virginia, by William M. Fontaine.
— Description of New Fossil Plants from the Dakota Group, by Leo Lesquereux.
— Report on the Denver Coal Basin, by S. F. Emmons.
— Report on Ten-Mile Mining District, Colorado, by S. F. Emmons.
— Report on Silver Cliff Mining District, by S. F. Emmons.
— Flora of the Dakota Group, by J. S. Newberry.
BULLETINS.

The Bulletins of the Survey will contain such x)apers 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 contains but one paper and is complete in itself. They aie, however, num-
bered in a continuous series, and may be united into volumes of convenient size. To facilitate this,
each Bulletin has two paginations, one proper to itself and another which belongs to it as part of the
volume.
Of this series of Bulletins Nos. 1 to 35 are already published, viz :
1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with
aGeologicalSketchofBuffaloPeaks, 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., by
Albert Williams, jr. 1883. 8°. 8 pp. Price 5 eents.
3. On the Fossil Faunas of the Upper Devonian, along the meridian of 76° 30', from Tompkins (bounty,
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.
7. Mapoteca Geologica Americana. A catalogue of geological maps of Ameiica (Xorth 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.
Van Hise. 1884. 8°. 56 pp. 6 pi. Price 10 cents.
9. Report of work done in the Washington Laboratory during the fiscal year 1883-'84. F. W. Clarke,
chief chemist ; T. M. Chatard, assistant. 1884. 8°. 40 pp. Price 5 cents.
10. On the Cambrian Faunas of North America. Preliminary studies, by Charles D. Walcott. 1884.
8°. 74 pp. 10 pi. Price 5 cents.
11. On the Quaternary and Recent MoUusca of the Great Basin ; with Descriptions of New Forms, by
R. Ellsworth Call; Introduced by a sketch of the Quaternary Lakes of the Great Basin, by G. K. GU-
bert. 1884. 8°. 66 pp. 6 pi. Price 5 cents.
12. A Crystallographic Study of the Thlnolite 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, 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, by Arnold
Hague and Joseph P. Iddings. 1885. 8°. 44 pp. Price 5 cents.
18. On Marine Eocene, Fresh-water Miocene, and other Fossil MoUusca 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 F. Becker. 1885. 8°. 28 pp. Price 5 cents.
20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W. F. Hille.
brand. 1885. 8°. 114 pp. 1 pi. Price 10 cents.
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