ADVERTISEMENT. Ill 
XXVIII. Tho 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°. G08pp. 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 Medusa}, 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 Goology, Petrography, 
and Paleontology, by Arnold Hague, J. P. Iddings, W. Harvey "Weed, Charles D. Walcott, G. H. Girty, 
T. W. Stanton, 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. Wood worth, and August F. 
Foerste. 1899. 4°: xx,402pp. 31 pi. Price $1. 
XXXIV. The Glacial Gravels of Maine and their Associated Deposits, by George II. Stone 1899. 
4°. xiii,499pp. 52 pi. Price $1.30. 
XXXV. The Later Extinct Floras of North America, by John Strong Newberry; edited by Arthur 
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, ami 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-Andesito and on Triclinic Pyroxene in Augit ic 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, toBradford 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. 
b. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884. 8°. 325 pp. 
Price 20 cents. 
6. Elevations in tho Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. Price 5 conts. 
7. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America ( North and South), 
1752-1881, in Geographic and Chronologic Order, by Jules Maicou 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 ami O.K. 
Van Hise. 1884. 8°. 56 pp. 6 pi. Price 10 cents. 
9. A Report of Work done in tho Washington Laboratory during the Fiscal Year 1883-'84. K. W. 
Clarke, Chief Chemist. T. M. Chatard, Assistant Chemist. 1884. 8°. 40 pp. Price 5cents. 
10. On the Cambrian Faunas of North America. Preliminary Studies, by Charles Doolittle Walcott. 
1884. 8°. 74 pp. 10 pi. Prico5 cents. 
11. On the Quaternary and Recent Mollusca of the Groat Basin; with Descriptions of New Forms, 
by R. Ellsworth Call. Introduced by a Sketch of the Quaternary Lakes of the Greal Basin, by o. K. 
Gilbert. 1884. 8°. 66 pp. 6 pi. Price 5 cents. 
12. A Crystallographic Study of the Thinolito of Lake Lahontan, by Edward S. Dana. 1884. 8°. 
34 pp. 3 pi. Price 5 cents. 
13. Boundaries of the United States and of tho Sevoral 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 Iron-Carburets, 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, Now York, by John M. Clarke. 1885. 8°, 
86 pp. 3 pi. Price 5 cents. 
