ADVERTISEMENT. Ill 
XXXY. 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 Intro- 
luction 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, 
07 pp. 73 pi. Price . 
XXXVIII. The Illinois Glacial Lobe, by Frank Leverett. 1899. 4°. xxi, 817 pp. 24 pi. Price . 
'n preparation : ■ 
— Adephagous and Clavicorn Coleoptera from the Tertiary Deposits at Florissant, Colorado, with 
)escriptions of a Few Other Forms and including a Systematic List of the Non-Rhyncophorous Ter- 
iary Coleoptera of North America, by Samuel Hubbard Scudder. 
— A Contribution to the Eocene and Lower Oligocene Coral Faunas of the t) nited States, containing 
)escriptions of a Few Doubtfully Cretaceous Species, by Thomas "Wayland Vaughan. 
— 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 
ieological 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.Yalue of Troy Ounces of Fine Metal, etc., 
omputed by Albert Williams, jr. 1883. 8°. 8 pp. Price 5 cents. 
3. OntheFossil Faunas of the Upper Devonian, along the Meridian of 76° 30', from Tompkins County, 
few 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 Dictionarj r of Altitudes in the United States, compiled by Henry Gannett. 1884. 8°. 325 pp. 
'rice 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) 
752-1881, in Geographic and Chronologic Order, by Jules Marcou and John Belknap Marcou. 1884. 
D . 184 pp. Price 10 cents. 
8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C. R. 
an 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. 
larke, 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. 
^84. 8°. 74 pp. 10 pi. Price 5 cents. 
11. On the Quaternary and Recent Mollusca of the Great Basin; with Descriptions of New Forms, 
y R. Ellsworth Call. Introduced by a Sketch of the Quaternary Lakes of the Great Basin, by G. K. 
ilbert. 1884. 8°. 66 pp. 6 pi. Price 5 cents. 
: 12. A Cr3'stallographic Study of the Thinolite of Lake Lahontan, by Edward S. Dana. 1884. 8°. 
t pp. 3 pi. Price 5 cents. 
13. Boundaries of the United States and of the Several States and Territories, with a Historical 
ietch 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 
jouhal. 1885. 8°. 238 pp. Price 15 cents. 
15. On the Mesozoic and Cenozoic Paleontology of California, by Charles A. AVhite. 1885. 8°. 33 pp. 
rice 5 cents. 
16. On the Higher Devonian Faunas of Ontario County, New York, by John M. Clarke. 1885. 8°. 
ipp. 3pl. Price 5 cents. 
17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with Notes on 
e Geology of the District, by Arnold Hague and Joseph P. Iddings. 1885. 8°. 44 pp. Price 5 
nts. 
18. On Marine Eocene. Fresh- Water Miocene, and Other Fossil Mollusca of Western North America, 
Charles A. White. 1885. 8°. 26 pp. 3 pi. Price 5 cents. 
19. Notes on the Stratigraphy of California, by George F. Becker. 1885. 8°. 28 pp. Price 5 cents, 
xhausted.) 
iO. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W. F. Hille- 
md. 1885. 8°. 114 pp. 1 pi. Price 10 cents. 
51. The Lignites of the Great Sioux Reservation; a Report on the Region between the Grand and 
yreau Rivers, Dakota, by Bailey Willis. 1885. 8°. 16 pp. 5 pi. Price 5 cents. 
12. On New Cretaceous Fossils from California, by Charles A. White. 1885. 8°. 25 pp. 5 pi. 
ice 5 cents. 
3. Observations on the Junction between the Eastern Sandstone and tins Keweenaw Series on 
weenaw Point, Lake Superior, by R. D. Irving and T. C. Chamberlin. 1885. 8°. 124 pp. 17 pi. 
ice 15 cents. 
