ADVERTISEMENT. VII 
21. A Bibliography of North American Paleontology, by Charles Rollin Keyes. 1894. 8°. 251 pp. 
ice 20 cents. 
22. Results of .Primary Triangulation, by Henry Gannett. 1894. 8 C . 412 pp. 17 pi. Price 25 cents. 
23. A Dictionary of Geographic Positions, by Henry Gannett. 1895. 8°. 183 pp. 1 pi. Price 15 
its. 
24. Revision of North American Fossil Cockroaches, by Samuel Hubbard Scudder. 1895. 8°. 176 
12 pi. Price 15 cents. 
25. The Constitution of the Silicates, by Frank Wigglesworth Clarke. 1895. 8°. 109 pp. Price 15 
ts. 
26. A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts, by 
yamin Kendall Emerson. 1895. 8°. 180 pp. 1 pi. Price 15 cents. 
27. Catalogue and Index of Contributions to North American Geology, 1732-1891, by Nelson 
ratio Darton. 1896. 8°. 1045 pp. Price 60 cents. 
18. The Bear River Formation and its Characteristic Fauna, by Charles A. White. 1895. 8°. 108 
11 pi Price 15 cents. 
19. Earthquakes in California in 1891, by Charles D. Perrine. 1895. 8°. 25 pp. Price 5 cents. 
50. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
1892 and 1893, by Fred Boughton Weeks. 1896. 8°. 210 pp. Price 20 cents. 
11. Report of Progress of the Division of Hydrography for the Calendar Years 1893 and 1894, by 
derick Haynes Newell, Topographer in Charge. 1895. 8°. 126 pp. Price 15 cents. 
52. The Disseminated Lead Ores of Southeastern Missouri, by Arthur Winslow. 1896. 8°. 31 pp. 
ce 5 cents. 
13. Contributions to the Cretaceous Paleontology of the Pacific Coast : The Fauna of the Knoxville 
Is, by T. W. Stanton. 1895. 8°. 132 pp. 20 pi. Price 15 cents. 
!4. The Cambrian Rocks of Pennsylvania, by Charles Doolittle Walcott. 1896. 8°. 43 pp. 15 pi. 
3e 5 cents. 
5. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
the Tear 1894, by F. B. Weeks. 1896. 8°. 141 pp. Price 15 cents. 
16. Volcanic Rocks of South Mountain, Pennsylvania, by Florence Bascom. 1896. 8°. 124 pp. 28 
Price 15 cents. 
7. The Geology of the Fort Riley Military Reservation and Vicinity, Kansas, by Robert Hay. 
i. 8°. 35 pp. 8 pi. Price 5 cents. 
8. Artesian- Well Prospects in the Atlantic Coastal Plain Region, by N. H. Darton. 1896. 8°. 228 
19 pi. Price 20 cents. 
9. Geology of the Castle Mountain Mining District, Montana, by W. H. Weed and L. V. Pirsson. 
1. 8°. 164 pp. 17 pi. Price 15 cents. 
0. Report of Progress of the Division of Hydrography for the Calendar Year 1895, by Frederick 
nes Newell, Hydrographer in Charge. 1896. 8°. 356 pp. Price 25 cents. 
1 1. The Eocene Deposits of the Middle Atlantic Slope in Delaware, Maryland, and Virginia, by Will- 
Bullock Clark. 1896. 8°. 167 pp. 40 pi. Price 15 cents. 
2. A Brief Contribution to the Geology and Paleontology of Northwestern Louisiana, by T. Way- 
. Vaughan. 1896. 8°. 65 pp. 4 pi. Price 10 cents. 
3. A Bibliography of Clays and the Ceramic Arts, by John C. Branner. 1896. 8°. 114 pp. Price 
jnts. 
1. The Moraines of the Missouri Coteau and their Attendant Deposits, by James Edward Todd. 
. 8°. 71 pp. 21 pi. Price 10 cents. 
3. The Potomac Formation in Virginia, by W.M.Fontaine. 1896. 8°. 149 pp. 2 pi. Price 15 cents. 
3. Bibliography and Index of North American Geology, Paleontology, Petrology, and Miner- 
y for the Year 1895, by F. B. Weeks. 1896. 8°. 130 pp. Price 15 cents. 
J. Earthquakes in California in 1895, by Charles D. Perrine, Assistant Astronomer in Charge of 
;hqwake Observations at the Lick Observatory. 1896. 8°. 23 pp. Price 5 cents. 
3. Analyses of Rocks, with a Chapter on Analytical Methods, Laboratory of the United States 
ogical Survey, 1880 to 1896, by F. W. Clarke and W. F. Hillebrand. 1897. 8°. 306 pp. Price 20 
s. 
). Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
he Year 1896, by Fred Boughton Weeks. 1897. 8°. 152 pp. Price 15 cents. 
). The Educational Series of Rock Specimens Collected and Distributed by the United States 
ogical Survey, by Joseph Silas Diller. 1898. 8°. 400 pp. 47 pi. Price 25 cents. 
I. The Lower Cretaceous Gryphaeas of the Texas Region, by R. T. Hill and T. Wayland Vaughan. 
8°. 139 pp. 35 pi. Price 15 cents. 
5. A Catalogue of the Cretaceous and Tertiary Plants of North America, by F. H. Knowlton. 
8°. 247 pp. Price 20 cents, 
t. A Bibliographic Index of North American Carboniferous Invertebrates, by Stuart Weller. 
8°. 653 pp. Price 35 cents. 
.. A Gazetteer of Kansas, by Henry Gannett. 1898. 8°. 246 pp. 6 pi. Price 20 cents. 
