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, 
geologist in charge of Rocky Mountain division. 1883. 8°. 42 pp., 2 pis. 
2. Gold and silver conversion tables, giving the coining value of troy ounces of fine 
metal, etc., computed by Albert Williams, jr. 1883. 8°. 8 pp. (Out of 
stock. ) 
3. On the fossil faunas of the Upper Devonian, along the meridian of 76° 3(K, from 
Tompkins County, N. Y., to Bradford County, Pa., by H. S. Williams. 1884. 
8°. 36 pp. 
4. On Mesozoic fossils, by Charles A. White. 1884. 8°. 36 pp., 9 pis. (Out of 
stock.) 
5. A dictionary of altitudes in the United States, compiled by Henry Gannett, chief 
geographer. 1884. 8°. 325 pp. (Out of stock.) 
6. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. 
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 B. Marcou. 1884. 8°. 184 pp. (Out of stock.) 
8. On secondary enlargements of mineral fragments in certain rocks, by R. D. 
Irving and 0. R. Van Hise. 1884. 8°. 56 pp., 6 pis. (Out of stock.) 
9. A report of work done in the Washington laboratory during the fiscal year 1883-84. 
F. W. Clarke, chief chemist; T. M. Chatard, assistant chemist. 1884. 8°. 40 
pp. (Out of stock.) 
10. On the Cambrian faunas of North America: Preliminary studies, by C. D. Wal- 
cott. 1884. 8°. 74 pp., 10 pis. (Out of stock.) 
11. On the Quaternary and Recent Mollusca of the Great Basin, with descriptions of 
new forms, by R. E. Call; introduced by a sketch of the Quaternary lakes of 
the Great Basin, by G. K. Gilbert. 1884. 8°. 66 pp., 6 pis. 
12. A crystallographic study of the thinolite of Lake Lahontan, by E. S. Dana. 
1884. 8°. 34 pp., 3 pis. 
13. Boundaries of the United States and of the several States and Territories, with 
a historical sketch of the Territorial changes, by Henry Gannett, chief geog- 
rapher. 1885. 8°. 135 pp. (Out of stock.) 
14. The electrical and magnetic properties of the iron-carburets, by Carl Barus and 
Vincent Strouhal. 1885. 8°. 238 pp. (Out of stock.) 
15. On the Mesozoic and Cenozoic paleontology of California, by C. A. White. 1885. 
8°. 33 pp. 
16. On the higher Devonian faunas of Ontario County, N. Y., by J. M. Clarke. 
1885. 8°. 86 pp., 3 pis. 
17. On the development of crystallization in the igneous rocks of Washoe, Nev.. 
with notes on the geology of the district, by Arnold Hague and J. P. Iddings. 
1885. 8°. 44 pp. 
18. On marine Eocene, fresh-water Miocene, and other fossil Mollusca of western 
North America, by C. A. White. 1885. 8°. 26 pp., 3 pis. (Out of stock.) 
19. Notes on the stratigraphy of California, by G. F. Becker 1885. 8°. 28 pp. 
(Out of stock.) 
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