ADVERTISEMENT. Ill 
XXVLTI. The Marquette Iron-Bearing District of Michigan, with Atlas, hy C. R. Van Hiso and W. 
Bayiey, including a Chapter on the Republic Trough, by H. L. Smyth. 1897. 4°. 608 pp. 35 pi. 
d atlas of 39 sheets folio. Price $5.75. 
XXIX. Geology of Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 
impden Counties, by Benjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 pi. Price $1.90. 
XXX. Fossil Medusae, 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. 
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, 
d Paleontology, by Arnold Hague, J. P. Hidings, W. Harvey Weed, Charles D. Walcott, G. H. Girty, 
W. Stanton, and F. H. Knowlton 1899. 4°. xvii,893pp. 121 pi. Price $2.45. 
^XXIII. Geology of the Narragansett Basin, by X. S. Shaler, J. B. Woodworth, and August F. 
erste. 1899. 4°. xx,402pp. 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 
.Hick. 1898. 4°. xviii, 295 pp. 68 pi. Price $1.25. 
5XXVI. The Crystal Falls Iron-Bearing District of Michigan, by J. Morgan Clements and Henry 
>yd Smyth ; with a Chapter on the Sturgeon River Tongue, by William Shirley Bayiey, and an 
troduction by Charles Richard Van Hise. 1899. 4°. xxxvi, 512 pp. 53 pi. Price $2. 
iXXVII. Fossil Flora of the Lower Coal Measures of Missouri, by David White. 1899. 4°. xi, 
pp. 73 pi. Price $1.25. 
JXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 1899. 4°. xxi, 817 pp. 24 pi. Price $1.60. 
preparation: 
£XXIX. The Eocene and Lower Oligocene Coral Faunas of the United States, with Descriptions 
a Few Doubtfully Cretaceous Species, by Thomas Wayland Vaughan. 
£L. Adephagous and Clavicorn Coleoptera from the Tertiary Deposits at Florissant, Colorado, with 
scriptions of a Few Other Forms and including a Systematic List of the Non-Rbyncophorous Ter- 
ry Coleoptera of North America, by Samuel Hubbard Scudder. 
- Flora of the Laramie and Allied Formations, by Frank Hall Knowlton. 
BULLETINS. 
. On Hypersthene-Andesite and on Triclinic Pyroxene in Augitic Rocks, by Whitman Cross, with a 
^logical Sketch of Buffalo Peaks, Colorado, by S. F. Emmons. 1883. 8°. 42 pp. 2 pi. Price 10 cents. 
. Gold and Silver Conversion Tables, giving the Coining Value of Troy Ounces of Fine Metal, etc., 
aputed by Albert Williams, jr. 1883. 8°. 8 pp. Price 5 cents. 
. On the Fossil Faunas of the Upper Devonian, along the Meridian of 76° 30', from Tompkins County, 
w York, to Bradford County, Pennsylvania, by Henry S. Williams. 1884. 8°. 36 pp. Price 5 cents. 
. On Mesozoic Fossils, by Charles A. White. 1884. 8°. 36 pp. 9 pi. Price 5 cents. 
. A Dictionary of Altitudes in the United States, compiled by Henry Gannett. 1884. 8°. 325 pp. 
ice 20 cents. 
i. Elevations in the Dominion of Canada, by J. W. Spencer. 1884. 8°. 43 pp. Price 5 cents. 
. Mapoteca Geologica Americana. A Catalogue of Geological Maps of America (North and South), 
2-1881, in Geographic and Chronologic Order, by Jules Marcou and John Belknap Marcou. 1884. 
184 pp. Price 10 cents. 
. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C. R. 
nHise. 1884. 8°. 56 pp. 6 pi. Price 10 cents. 
. A Keport of Work done in the Washington Laboratory during the Fiscal Year 1883-'84. F. W. 
,rke, Chief Chemist. T. M. Chatard, Assistant Chemist. 1884. 8°. 40 pp. Price 5 cents. 
0. On the Cambrian Faunas of North America. Preliminary Studies, by Charles Doolittle Walcott. 
4. 8°. 74 pp. 10 pi. Price 5 cents. 
1. On the Quaternary and Recent Mollusca of the Great Basin; with Descriptions of New Forms, 
R. Ellsworth Call. Introduced by a Sketch of the Quaternary Lakes of the Great Basin, by G. K. 
bert, 1884. 8°. 66 pp. 6 pi. Price 5 cents. 
2. A Crystallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8°. 
pp. 3 pi. Price 5 cents. 
3. Boundaries of the United States and of the Several States and Territories, with a Historical 
itchof the Territorial Changes, by Henry Gannett. 1885. 8°. 135 pp. Price 10 cents. (Exhausted.) 
4. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent 
ouhal. 1885. 8°. 238 pp. Price 15 cents. 
5. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. White. 1885. 8°. 33 pp. 
ce 5 cents. 
5. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke. 1885. 8°, 
>p. 3 pi. Price 5 cents. 
