ADVERTISEMENT. Ill 
XXVITT. The Marquette Iron-Bearing Districl of Michigan, with Atlas, by C. R. Van Hise and W. 
S. Bayley, including a Chapter on the Republic Trough, by H. L. Smyth. 1897. 4°. 608 pp. 35 pi. 
and atlas of 39 sheets folio. Price $5.75. 
XXIX. Geology of Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 
Hampden Counties, by Benjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 pi. Price $1.90. 
XXX. Fossil Medusrc, by Charles Doolittle Walcott. 1898. 4°. ix, 201 pp. 47 pi. Price $1.50. 
XXXI. Geology of the Aspen Mining District, Colorado, with Atlas, by Josiah Edward Spurr. 1898. 
4°. xxxv, 260 pp. 43 pi. and atlas of 30 sheets folio. Price $3.60. 
XXXII. Geology of the Yellowstone National Park, Part II, Descriptive Geology, Petrography, 
and Paleontology, by Arnold Hague, J. P. Iddings, W. Harvey Weed, Charles D. Walcott, (J. II. Girty, 
T. W. Stanton, and F. H. Knowlton. 1899. 4°. xvii,893pp. 121 pi. Price $2.45. 
XXXIII. Geology of the Narragansett Basin, by X. S. Shaler, J. B. Woodwortli. and August F. 
Foerste. 1899. 4°. xx,402pp. 31 pi. Price $1. 
XXXIV. The Glacial Gravels of Maine and their Associated Deposits, by George H. Stone. 1899. 
4°. xiii,499pp. 52 pi. Price $1.30. 
XXXV. The Later Extinct Floras of North America, by John Strong Newberry ; edited by A rthur 
Hollick. 1898. 4°. xviii, 295 pp. 68 pi. Price $1.25. 
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, and an 
Introduction by Charles Richard Van Hise. 1899. 4°. xxxvi, 512 pp. 53 pi. Price $2. 
XXXVII. Fossil Flora of the Lower Coal Measures of Missouri, by David White. 1899. 4°. xi, 
467 pp. 73 pi. Price $1.25. 
XXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 1899. 4°. xxi, 817 pp. 24 pi. Price $1.60. 
In preparation: 
XXXIX. The Eocene and Lower Oligocene Coral Faunas of the United States, with Descriptions 
of a Few Doubtfully Cretaceous Species, by Thomas Wayland Vaughan. 
— Adephagous and Clavicorn Coleoptera from the Tertiary Deposits at Florissant, Colorado, with 
Descriptions of a Few Other Forms and including a Systematic List of the Non-Rhyncophorous Ter- 
tiary Coleoptera of North America, by Samuel Hubbard Scudder. 
— 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 Value 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, 
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 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 ('. 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. F. W. 
Clarke, Chief Chemist. T. M. Chatard, Assistant Chemist. 1884. 8°. 40pp. Price 5 cents. 
10. On the Cambrian Faunas of North America. Preliminary Studies, by ' iharles Doolittle Walcott. 
1884. 8°. 74 pp. 10 pi. Price 5 cents. 
11. On the Quaternary and Recent Mollusca 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. 
Gilbert. 1884. 8°. 66 pp. 6 pi. 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°. 135pp. Price 10 cents. (Exhausted.) 
14. The Electrical and Magnetic Properties of the I mil < 'arluuvts, by Carl Barns 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°. 33pp. 
Price 5 cents. 
16. On the Higher Devonian Faunas of Ontario County, New fork, by John M. Clarke. 1885. 8° 
86 pp. 3 pi. Price 5 cents. 
