ADVERTISEMENT. VII 
134. The Cambrian Rocks of Pennsylvania, by Charles Dpolittle "Walcott. 1800. 8°. 43 pp. 15 pi. 
Price 5 cents. 
135. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for the Year 1894, by F. B. Weeks. 1896. 8°. 141pp. Price 15 cents. 
136. Volcanic Rocks of South Mountain, Pennsylvania, by Florence Basconi. 1896. 8°. 124 pp. 28 
pi. Price 15 cents. 
137. The Geology of the Fort Riley Military Reservation and Vicinity, Kansas, by Robert Hay. 
1896. 8°. 35 pp. 8 pi. Price 5 cents. 
138. Artesian-Well Prospects in the Atlantic Coastal Plain P^gion, by N.H. Barton. 1896. 8°. 228 
pp. 19 pi. Price 20 cents. 
139. Geology of the Castle Mountain Mining District, Montana, by W. H. Weed and B. V. Pirsson. 
1896. 8°. 164 pp. 17 pi. Price 15 cents. 
140. Report of Progress of the Division of Hydrography for the Calendar Year 1895, by Frederick 
Haynes Newell, Hydrographer in Charge. 1896. 8°. 356 pp. Price 25 cents. 
141. The Eocene Deposits of the Middle Atlantic Slope in Delaware, Maryland, and Virginia, by Will- 
iam Bullock Clark. 1896. 8°. 167 pp. 40 pi. Price 15 cents. 
142. A Brief Contribution to the Geology and Paleontology of Northwestern. Bouisiana, by T. Way- 
land Vaughan. 1896. 8°. 65 pp. 4 pi. Trice 10 cents. 
143. A Bibliography of Clays and the Ceramic Arts, by John C. Branner. 1896. 8°. 114 pp. Price 
15 cents. 
144. The Moraines of the Missouri Coteau and their Attendant Deposits, by James Edward Todd. 
1896. 8°. 71 pp. 21 pi. Price 10 cents. 
145. The Potomac Formation in Virginia, by W. M. Fontaine. 1896. 8°. 149 pp. 2 pi. Price 15 cents. 
146. Bibliography and Index of North American Geology, Paleontology, Petrology, and Miner- 
alogy for the Year 1895, by F. B. Weeks. 1896. 8°. 130 pp. Price 15 cents. 
147. Earthquakes in California in 1895, by Charles D. Perrine, Assistant Astronomer in Charge of 
Earthquake Observations at the Bick Observatory. 1896. 8°. 23 pp. Price 5 cents. 
148. Analyses of Rocks, with a Chapter on Analytical Methods, Baboratory of the United States 
Geological Survey, 1880 to 1896, by F.W.Clarke and W. F. Hillebrand. 1897. 8°. 306 pp. Price 20 cents. 
149. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for the Year 1896, by Fred Boughton Weeks. 1897. 8°. 152 pp. Price 15 cents. 
150. The Educational Series of Rock Specimens Collected and Distributed by the United States 
Geological Survey, by Joseph Silas Diller. 1898. 8°. 400 pp. 47 pi. Price 25 cents. 
151. The Bower Cretaceous Gryphseas of the Texas Region, by R. T. Hill and T. Wayland Vaughan. 
1898. 8°. 139 pp. 35 pi. Price 15 cents. 
152. A Catalogue of the Cretaceous and Tertiary Plants of North America, by F. H. Knowlton. 
1898. 8°. 247 pp. Price 20 cents. 
153. A Bibliographic Index of North American Carboniferous Invertebrates, by Stuart Weller. 1898. 
8°. 653 pp. Price 35 cents. 
154. A Gazetteer of Kansas, by Henry Gannett. 1898. 8°. 246 pp. 6 pi. Price 20 cents. 
155. Earthquakes in California in 1896 and 1897, by Charles D. Perrine, Assistant Astronomer in 
Charge of Earthquake Observations at the Bick Observatory. 1898. 8°. 47 pp. Price 5 cents. 
156. Bibliography and Index of North American Geology, Paleontologj', Petrology, and Mineralogy 
for the Year 1897, by Fred Boughton Weeks. 1898. 8°. 130 pp. Price 15 cents. 
160. A Dictionary of Altitudes in the United States (Third Edition), compiled by Henry Gannett. 
1899. 8°. 775 pp. Price 40 cents. 
161. Earthquakes in California in 1898, by Charles D. Perrine, Assistant Astronomer in Charge of 
Earthquake Observations at the Bick Observatory. 1899. 8°. 31pp. 1 pi. Price 5 cents. 
162. Bibliography and Index of North American Geology, Paleontologj-, Petrology, and Mineralogy 
for the Year 1898, by Fred Boughton Weeks. 1899. 8°. 163 pp. Price 15 cents. 
In preparation : 
157. The Gneisses, Gabbro-Schists, and Associated Rocks of Southwestern Minnesota, by Christopher 
Webber Hall. 1899. 8°. — pp. 27 pi. Price — cents. 
158. The Moraines of Southeastern South Dakota and their Attendant Deposits, by James Edward 
Todd. 
159. The Geology of Eastern Berkshire County, Massachusetts, by B. K. Emerson. 1899. 8° 139 
pp. 9 pi. Price . 
— Flora of the Montana Formation, by Frank Hall Knowlton. 
— Reconnaissance in the Rio Grande Coal Fields of Texas, by Thomas Wayland Vaughan, includ- 
ing a Report on Igneous Rocks from the San Carlos Coal Fields, by E. C. E. Bord. 
WATER-SUPPEY AND IRRIGATION PAPERS. 
By act of Congress approved June 11, 1896, the following provision was made: 
"Provided, That hereafter the reports of the Geological Survey in relation to the gauging of 
streams and to the methods of utilizing the water resources may be i)rinted in octavo form, not to 
exceed one hundred pages in length and five thousand copies in number; one thousand copies of 
which shall be for the official use of the Ceological Survey, one thousand five hundred copies shall be 
delivered to the Senate, and two thousand live hundred copies shall be delivered to the House of Rep- 
resentatives, for distribution. ' ; 
