AT>VERTISEMENT. VII 



I'Jl. A I5il)lioj;iiii)liy of Korlh Aniericiin I'liloontoloirj-, by Charles Rolliii Keyea. 1804. 8"^. 2r)I pp. 

 Priie 20 cents 

 122. Kesiilt.s of rriinary Tiian;;iilatii>n, l.y Henry Oaiinett. 1894. 8<^. 412 pp. 17 pi. Prioo 25 cents. 

 12:1. A Dictionary of Geographic Positions, liy Henry Gannett. 1805. 8". 18^ pp. l-pl. Price 15 



cents. 



124. Revision of Korth Aaierican Fossil Cockroaches, by Samnel Hubbard Scudder. 1895. 8^. 170 



pp 12 III. Price 15 cents. 



125. The Con.stitution of the Silicates, by Frank "VTigglesworth Clarke. 189.5. 8°. 109 pp. Price 15 



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126. A 'Mineralofrical Lexicon of Franklin Hanipsliire, and Hampden Counties, Massachusetts, by 

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127. Catalogue and Index of Contributions to Korth American Geology, 1732-1891, by Kelson 

 Horatio Darton 189G. 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. F.arthqnakes in Californiii in 1894, by Charles D. Perrine. 1895. 8'^. 25 pp. Price 5 cents. 



130. Bibliography and lude-c of North American Geology, Paleontology, Petrology, and Mineralogy 

 for 1892 and 189:5 by F>ed P.oughton 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 

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132. The Disseminated Lead Ores of Southeastern Missouri, by Arthur Winslow. 1896. 8°. 31pp. 

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133. Contributions to the Cretaceous Paleontology of the Pacific Coast : The Fauna of the Knoxville 

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134 The Cambrian Rocks of Pennsylvania, by Charles Doolittle Walcott. 1896. 8^. 43 pp. 15 pi. 

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135 Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 

 for the Tear 1894 by F. B. Weeks. 1896. 8". 141pp. Price 15 cents. 



130 Volcanic Rocks of South Mountain, Pennsylvania, by Florence Basconi. 1896. 8°. 124 pp. 28 

 jil Price 15 cents. 



11". The Geology of the Fort Riley Military Reservation and Vicinity, Kansas, by Robert Hay. 

 1890. 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 

 ])]) 19 pi Price 20 cents. 



i:!9 Geology of the (!'astle ^Mountain Mining District, Montana, by W. H. Weed and I>. V. Pirsson. 

 1890. 8^ 164 pp 17])1. Price 15 cents. 



140 Report o) Progress of the Division of Hydrograph.y for the Calendar Year 1895, by Frederick 

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141 The Eocene Deposits of the Middle Atlantic Slope in Delaware, Maryland, and Virginia, by Will- 

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142 A Brief Contribution to the Geology and Paleontidogy of Northwestern Louisiana, by T. Way 

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143. A Bibliograi)liy of Clays and the Ceramic Arts, by John C. Branner. 1806. 8"^. 114 pji. Price 

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144. The Aloraines of tho Missouri Cotean and their Attendant Deposits, bj' James Edward Todd. 

 1896. 8^. 71pp. 21 pi I'rice 10 cents. 



145. The Potomac Formation in Virginia, by W.M. Fontaine. 1896. 8°. 149 pp. 2 pi. Price 15cents. 



146. Bibliography and Index of North American Geology, Paleontology, Petrology, and Miner- 

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147. F'arthquakes in California in 1895 by Charles D. Perrine, Assistant Astronomer in Charge of 

 Eartliiiiiiike Obsetvatioiis at the Lick Observatory 1896 8". 23 pp. Price 5 cents. 



148. Analyses of Rocks, with a Cliapter on Analytical Methods, Laboratory of the United States 

 Geological Survey, 1880 to 1896, by F. W. Clarke an.l W. F. Hillebrand. 1897. 8^. 306 pp. Price 20 

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149. Bihliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 

 for the Year l.-^oe by Fred Boughton Weeks. 1897. 8^. 152 jip. Price 15 cents. 



1.50. The Eiliicational Series of Rock Specimens Collected and Distributed bj' the United States 

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151 . The Lower Cretaceous Grypha^as of the Texas Region, by R. T. Hill and T. Wayland Vaughan. 

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152. A Catalogue of the Cretaceous and Tertiary Plants of North America, by F. H. Knowlton. 

 1898. 8\ 247 lip Price 20 cents. 



1.53. A Bibiii)graj)hic Index of North American Carlxuiiferous Invertebrates, by Stuart Weller. 

 1898. 8'^. 6.53 pp. Price 35 cents 



154. A Gazetteer of Kan.sas, by Henry Gannett. 1898. 8^. 246 pp. C pi. Price 20 cents. 



1.55 E:irthii;i.;ke8 in Caliloruia in 1890 aii<l 1897, by Charles D. Perrine, Assistant Astronomer in 

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