ADVERTISEMENT. VII 
121. A Bibliography of North American Paleontology, by Charles Roll in Keyes. 1894. 8°. 251pp. 
Price 20 cents. 
122. Results of Primary Triangnlation, by Henry Gannett. 1894. 8°. 412 pp. 17 pi. Price 25 cents. 
123. A Dictionary of Geographic Positions, by Henry Gannett. 1895. 8°. 183 pp. I pi. I'rice 15 
cents. 
124. Revision of North American Fossil Cockroaches, by Samuel Hubbard Sciuhhr. 1895. 8°. 176 
pp. 12 pi. Price 15 cents. 
125. The Constitution of the Silicates, by Frank Wigglesworth Clarke. 1895. 8°. 109 pp. Price 15 
cents. 
126. A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts, by 
Benjamin Kendall Emerson. 1895. 8°. 180 pp. 1 pi. Price 15 cents. 
1-7. Catalogue and Index of Contributions to North American Geology, 1732-1891, by Nelson 
Horatio Barton. 1896. 8°. 1045 pp. Price 60 cents. 
128. Tho Bear River Formation and its Characteristic Fauna, by Charles A. White. 1895. 8°. 108 
pp. 11 pi. Prico 15 cents. 
129. Earthquakes in California in 1894, by Charles D. Perrine. 1895. 8°. 25 pp. Trice 5 cents. 
130. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for 1892 and 1893, by Fred Boughton Weeks. 1896. 8°. 210 pp. Price 20 cents. 
131. Report of Progress of the Division of Hydrography for the Calendar Years 1893 and 1894, by 
Frederick Haynes Newell, Topographer in Charge. 1895. 8°. 126 pp. Price 15 cents. 
132. The Disseminated Lead Ores of Southeastern Missouri, by Arthur Winslow. 1896. 8°. 31 pp. 
Price 5 cents. 
133. Contributions to the Cretaceous Paleontology of the Pacific Coast : The Fauna of tho Knoxville 
Beds, by T. AY. Stanton. 1895. 8°. 132 pp. 20 pi. Price 15 cents. 
134. The Cambrian Rocks of Pennsylvania, by Charles Doolittle Walcott. 1896. 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°. 141 pp. Price 15 cents. 
136. Volcanic Rocks of South Mountain, Pennsylvania, by Florence Bascom. 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 Region, by X. 11. Darton. 1896. 8°. 228 
pp. 19 pi. Price 20 cents. 
139. Geology of the Castle Mountain Mining District, Montana, by W. H."Weed and L. V. Pirsson. 
1896. 8°. 164 pp. 17 pi. Price 15 cents. 
140. Report of Progress of the Division of Hydrography for the Calendar Year L895, 1>\ Frederick 
Haynes Newell. Hydrographer in Charge. 1896. 8°. 356 pp. Price 25 cents. 
141. The Eocene Deposits of tho Middle Atlantic Slope in Delaware, Maryland, and Virginia, by Will- 
iam Ibillock Clark. 1896. 8°. 167 pp. 40 pi. Price 15 cents. 
142. A Brief Contribution to the Geology and Paleontology of Northwestern Louisiana, by T. Way- 
land Vaughan. 1896. 8°. 65 pp. 4 pi. Price 10 cents. 
143. A Bibliography of Clays and the Ceramic Arts, by John C. Branner. 1896. 8°. 114pp. Price 
15 cents. 
144. The Moraines of tho Missouri Coteau and thoir 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. Prico IScents. 
146. Bibliography and Index of North American Geology, Paleontology, Petrology, and Miner- 
alogy for tho Year 1895 by F. B. Weeks. 1896. S^. 130 pp. Price 15 cents. 
147. Earthquakes in California in 1895, by Charles I>. Perrine, Assistant Astronomer in Charge of 
Earthquake Observations at the Lick Observatory. 1896. 8°. 23 ] p. Price 5 c< uts. 
148. Analyses of Rocks, with a Chapter on Analytical Methods, Laboratory 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].].. 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. Tho Lower Cretaceous Gryphaeas of the Texas Region, by R. T. Hill and T. Wayland Vaughan. 
1898. 8°. 139 pp. 35 pi. Prico 15 cents. 
152. A Catalogue of the Cretaceous and Tertiary Plants of North America, by F II. 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. pi. Prico 20 cents. 
