ADVERTISEMENT. VII 
121. A Bibliography of North American Paleontology, by Charles Rollin Key es. 1894. 8°. 251pp. 
Price 20 cents. 
122. Results of Primary Triangulation, by Henry Gannett. 1894. 8 C . 412pp. 17 pi. Price 25 cents. 
123. A Dictionary of Geographic Positions, by Henry Gannett. 1895. 8°. 183 pp. 1 pi. Price 15 
cents. 
124. Revision of North American Fossil Cockroaches, by Samuel Hubbard Scudder. 1895. 8°. 176 
pp. 12 pi. Price 15 cents. 
125. The Constitution of the Silicates, by Prank Wiggleswori h 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. 
127. Catalogue and Index of Contributions to North American Geology. 1732-1891, by Nelson 
Horatio Darton. 1896. 8°. 1045 pp. Price CO cents. 
128. The Bear River Formation and its Characteristic Fauna, by Charles A. White. 1895. 8°. 108 
pp. 11 pi. Price 15 cents. 
129. Earthquakes in California in 1894, by Charles D. Ferrine. 1895. 8°. 25 pp. Price 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 Havnes 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. 
I Price 5 cents. 
133. Contributions to the Cretaceous Paleontology of the Pacific Coast : The Fauna of the Knoxville 
Beds, by T. W. 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 Tear 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 
I. 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 N.H. Darton. 1896. 8°. 228 
>p. 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 1895, by Frederick 
Elaynes 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- 
am Bullock 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- 
andVaughan. 1896. 8°. 65 pp. 4 pi. Price 10 cents. 
143. A Bibliography of Clays and the Ceramic Arts, by John C. Branner. 1896. 8°. 114 pp. Price 
5 cents. 
144. The Moraines of the Missouri Coteau and their Attendant Deposits, by James Edward Todd. 
896. 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- 
logy 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 Lick Observatory. 1896. 8°. 23 pp. Price 5 cents. 
148. Analyses of Rocks, with a Chapter on Analytical Methods. Laboratory of the United States 
Jeological Survey, 1880 to 1896, by F. W. Clarke and W. F. Hillebrand. 1897. 8°. 306 pp. Price 20 
ents. 
149. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
or 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 
feological Survey, by Joseph Silas Diller. 1898. 8°. 400 pp. 47 pi. Price 25 (ents. 
151. The Lower Cretaceous Gryphaeas of the Texas Region, by R. T. Hill and T. Wayland Vaughan. 
898. 8°. 139 pp. 35 pi. Price 15 cents. 
152. A Catalogue of the Cretaceous and Tertiary Plants of North America, by F. H. Knowlton. 
398. 8°. 247 pp. Price 20 cents. 
153. A Bibliographic Index of North American Carboniferous Invertebrates, by Stuart Weller. 
398. 8-. 653 pp. Price 35 cents. 
154. A Gazetteer of Kansas, by Henry Gannett. 1898. 8°. 246 pp. 6 pi. Price 20 cents. 
