VI ADVERTISEMENT. 
106. The Colorado Formation and its Invertebrate Fauna, 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 Uussell. 1893. 8°. K>8pp 
12 pi. Price 15 cents. 
109. The Eruptive and Sedimentary Rocks on Pigeon Point, Minnesota, and their contact phenora 
ena, by William Shirley Bayley. 1893. 8°. 121 pp. 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 P.ig Stone Gap Coal Field of Virginia and Kentucky, by Marius P.. 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 cent 
113. A report of work done in the Division of Chemistry during the fiscal years 1891-'92 anj 
1892-93. F. TV. 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 1 
cents. 
11"/ . 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°. 251 pp 
Price 20 cents. 
122. Results of Primary Triangulation, by Henry Gannett. 1894. 8°. 412 pp. 17 pi. Price25 cents 
123. A Dictionary of Geographic Positions, by Henry Gannett, 1895. 8°. 183 pp. 1 pi. Price 1. 
cents. 
124. Revision of North American Fossil Cockroaches, by Samuel Hubbard Scudder. 1895. 8°. 17' 
pp. 12 pi. Price 15 cents. 
125. The Constitution of the Silicates, by Frank TVigglesworth Clarke. 1895. 8°. 109 pp. Price 1, 
cents. 
126. A Mineralogical Lexicon of Franklin, Hampshire, and Hampden counties, Massachusetts, b^ 
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 Nelsoi 
Horatio Darton. 1896. 8°. 1045 pp. Price 60 cents. 
128. The Bear River Formation and its Characteristic Fauna, by Charles A. White. 1895. 8°. 10 
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, b 
Frederick Haynes Newell, topographer in charge. 1895. 8°. 126 pp. Price 15 cents. 
132 The Disseminated Lead Ores of Southeastern Missouri, by Arthur TVinslow. 1896. 8°. 31 pp 
Price 5 cents. 
133. Contributions to the Cretaceous Paleontology of the Pacific Coast: The Fauna of the Knoxvill 
Beds, by T. TV. 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 p] 
Price 5 cents. 
135. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralog; 
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. 2 
pi. Price 15 cents. 
140. Report of Progress of the Division of Hydrography for the calendar year 1895, by Frederic] 
Haynes Newell, hydrographer in charge. 1896. 8°. 356 pp. Price 25 cents. 
In prets : 
137. Geology of the Fort Riley Military Reservation, Kansas, by Robert Hay. 
138. Artesian-well Prospects in the Atlantic Coastal Plain Legion, by N. H. Darton. 
139. Geology of the Castle Mountain Mining District, Montana, by W. H. Weed and L. V. Pirsson 
141. The Eocene Deposits of the Middle Atlantic Slope in Delaware, Maryland, and Virginia, by Wil 
liain Bullock Clark. 
142. A Brief Contribution to the Geology and Paleontology of Northwestern Louisiana, by T. TVav 
land Vaughan. 
143. A Bibliography of Clays ami the Ceramic Arts, by John C. Branner. 
144. The Moraines of the Missouri Coteau and their attendant deposits, by James Edward Todd 
145. The Potomac Formation in Virginia, by W. M. Fontaiue. 
