ADVERTISEMENT. Ill 
XXVIII. The Marquette Iron-Bearing District of Michigan, with Atlas, by C. R. Van Eise and W. 
S. Bayley, including a Chapter on the Republic Trough, by II. L. Smyth. L897. 4 . cos 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 Medusas, by Charles Doolittle Walcott. 1898. 4°. ix, 201 pp. 47 pi. Price$1.50. 
XXXI. Geology of the Aspen Mining District. Colorado, with Atlas. byJosiah Edward Spurr. 1898. 
4 . \\\v, 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 I>. Walcott, G. II. I rirty, 
T.W.Stanton, and F. H. Knowlton. 1899. 4°. xvii,893pp. 121 pi. Price $2.45. 
XXXIII. Geology of the Narragansett Basin, by N. S. Shaler, J. B.Woodworth, and A.ugust 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 1».\ 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, 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, 817pp. 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-Rbyneophorous 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 D . 8 pp. Price 5 cents. 
3. On the Fossil Faunas of the Upper Devonian, along the Meridian of 70° 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. 
D. 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 ( Xorth 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 Peport 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 Lakes of the Greal 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 - 
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 Iron-Carburets, bj Carl Bar US and Vincent 
Strouhal. 1885. 8°. 238 pp. Price 15 cents. 
15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. L885. 8 . 33 pp 
Price ."> cents. 
16. On the Higher Devonian Faunas of Ontario County, New York, by -John M. (lark.. 1885. - 
86 pp. 3 pi. Price 5 cents. 
