ADVERTISEMENT. Ill 
XXVIII. The Marquette Iron-Bearing District of Michigan, with Atlas, by C. R. Van Hise and W. 
. Bayley, including a Chapter on the Republic Trough, by H. L. Smyth. 1897. 4°. 608 pp. 35 pi. 
iid atlas of 39 sheets folio. Price $5.75. 
XXIX. Geology of Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 
[ampden Counties, by Benjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 pi. Price $1.90. 
XXX. Fossil Medusse, 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 
D . 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 
aleontology, by Arnold Hague, J. P. Iddings, W. Harvey Weed, Charles D. Walcott, G. H. Girty, T. W. 
tanton, and F. H. Knowlton. 1899. 4°. xvii, 893 pp. 121 pi. Price $2.45. 
XXXIII. Geology of the Narragansett Basin, by N. S. Shaler, J. B. Woodworth, and August F. 
■oerste. 1899. 4°. xx, 402 pp. 31 pi. Price $1. 
XXXIV. The Glacial Gravels of Maine and their Associated Deposits, by George H. Stone. 1899. 
°. xiii, 499 pp. 52 pi. Price $1.30. 
XXXV. The Later Extinct Floras of North America, by John Strong Newberry; edited by Arthur 
lollick. 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 
Joyd Smyth; with a Chapter on the Sturgeon River Tongue, by William Shirley Bayley, and an 
ntroduetion 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, 
i67 pp. 73 pi. Price $1.25. 
XXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 1899. 4°. xxi, 817 pp. 24 pi. Price $1.60. 
XXXIX. The Eocene and Lower Oligocene Coral Faunas of the United States, with Descriptions of 
i Few Doubtfully Cretaceous Species, by T. Wayland Vaughan. 1900. 4°. 263 pp. 24 pi. Price $1.10. 
XL. Adephagous and Clavicorn Coleoptera from the Tertiary Deposits at Florissant, Colorado, with 
Descriptions of a Few Other Forms and a Systematic List of the Non-Rhyncophorous Tertiary 
Holeoptera of North America, by Samuel Hubbard Scudder. 1900. 4°. 148 pp. 11 pi. Price 80 cents. 
Tn preparation: 
— Flora of the Laramie and Allied Formations, by Frank Hall Knowlton. 
— Glacial Formations and Drainage Features of the Erie and Ohio Basins, by Frank Leverett. 
BULLETINS. 
1. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a 
ecological 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 C. 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°. 40 pp. Price 5 cents. 
10. On the Cambrian Faunas of North America. Preliminary Studies, by Charles 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 Lat es 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°. 135 pp. Price 10 cents. (Exhausted.) 
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. 
