VI ADVERTISEMENT. 
106. The Colorado Formation and its Invertebrate Fanna, by T. TV. Stanton. 1893. 8°. 288 pp. 
45 pi. Price 20 cents. 
107. The Trap Dikes of the Lake Champlain Region, by James Furman Kemp and Vernon Free- 
man Marsters. 1893. 8°. 62 pp. 4 pi. Price 10 cents. 
108. A Geological Reconnoissance in Central Washington, by Israel Cook Russell. 1893. 8°. 108pp. 
12 pi. Price 15 cents. 
109. The Eruptive and Sedimentary Pocks on Pigeon Point, Minnesota, and their Contact Phenom- 
ena, by William Shirley Bayley. 1893. 8°. 121pp. 16 pi. Price 15 cents. 
110. The Paleozoic Section in the Vicinity of Three Forks, Montana, by Albert Charles Peale. 1893. 
8°. 56 pp. 6 pi. Price 10 cents. 
111. Geology of the Big Stone Gap Coal Field of Virginia and Kentucky, by Marius It. Campbell, 
1893. 8°. 106 pp. 6 pi. Price 15 cents. 
112. Earthquakes in California in 1892, by Charles D. Perrine. 1893. 8°. 57 pp. Price 10 cents. 
113. A Report of Work done in the Division of Chemistry during the Fiscal Years 1891-'92 and 
1892-'93. F. W. Clarke, Chief Chemist. 1893. 8°. 115 pp. Price 15 cents. 
114. Earthquakes in California in 1893, by Charles D. Perrine. 1894. 8°. 23 pp. Price 5 cents. 
115. A Geographic Dictionary of Rhode Island, by Henry Gannett. 1894. 8°. 31pp. Price 5 cents. 
116. A Geographic Dictionary of Massachusetts, by Henry Gannett. 1894. 8°. 126 pp. Price 15 
cents. 
117. A Geographic Dictionary of Connecticut, by Henry Gannett. 1894. 8°. 67 pp. Price 10 cents. 
118. A Geographic Dictionary of New Jersey, by Henry Gannett. 1894. 8°. 131pp. Price 15 cents. 
119. A Geological Reconnoissance in Northwest Wyoming, by George Homans Eldridge. 1894. 8°. 
72 pp. 4 pi. Price 10 cents. 
120. The Devonian System of Eastern Pennsylvania and New York, by Charles S. Prosser. 1894. 
8°. 81 pp. 2 pi. Price 10 cents. 
121. A Bibliography of North American Paleontology, by Charles Rollin Keyes. 1894. 8°. 251pp. 
Price 20 cents. 
122. Results of Primary Triangulation, 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. 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 Frank Wigglesworth Clarke. 1895. 8°. 109 pp. Pricel5 
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 60 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. Perrine. 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 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°. 31pp. 
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 Year 1894, by F. B. Weeks. 1896. 8°. 141pp. 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 N. H. 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 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 Louisiana, by T. Way- 
land Vaughan. 1896. 8°. 65 pp. 4 pi. Price 10 cents. 
