IV ADVERTISEMENT. 



49. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New Mexico, by Robert 

 Simpson Woodward. 1869. 8°. ISU pp. Price 15 cents. 



50. Forniulas and Tables to facilitate the Construction and Use of Maps, by Robert Simpson 

 Woodward. 1889. 8^. 124 pp. Price 15 cents. 



51. On Invertebrate Fos.sils from the Pacific Coast, by Charles Abiatbar White. 1889. 8°. 102 

 pp. 14 pi. Price 15 cents. 



52. Subaijrial Decay of Rocks and Origin of the Red Color of Certain Formations, by Israel Cook 

 Russell. 1889. 8°. 65 pp. 5 pi. Price 10 cents. 



53. The Geology of Nantucket, by Nathaniel SouthgateShaler. 1889. 8°. 55 pp. 10 pi. Price 

 IG cents. 



54. On tihe Thermo-Electric Measurement of High Temperatures, by Carl Barns. 1889. 8°. 

 313 pp. incl. 1 pi. 11 pi. Price 2h cents. 



5.">. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 

 lS86-'87 Frank Wigglesworth Clarke, chief chemist. 1889. 8". 96 pp. Price 10 cents. 



56. Fossil Wood and Lignite of the Potomac Formation, by Frank Hall Knowlton. 1889. 8°. 

 72 pp. 7 pi. Price 10 cents. 



a!. A Geological Reconnaissance in Southwestern Kansas, by Robert Hay. 1890. 8°. 49 pp. 

 2 pi. Price 5 cents. 



58. The Glacial Boundary in Western Pennsylvania, Ohio, Kentucky, Indiana, and Illinois, by 

 George Frederick Wright, with an introduction by Thomas Chrowder Chamberlin. 1890. 8°. 112 

 pp. incl. 1 pi. 8 pi. Price 15 cents. 



,=i9. The Gabbros and Associated Rocks in Delaware, by Frederick D.Chester. 1890. 8°. 45pp. 

 1 pi. Price 10 cents. 



60. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 

 1887-V8. F. W. Clarke, chief chemist. 1890. 8°. 174 pp. Price 15 cents. 



61. Contributions to the Mineralogy of the Pacific Coast, by William' Harlow Melville and Wal- 

 demar Lindgren. 1890. 8°. 40 pp. 3 pi. Price 5 cents. 



62. The Greenstone Schist Areas of The Menominee and Marquette Regions of Michigan, a contri- 

 bution to the subject of dynamic metamorphism in eruptive rocks, by George Huntington Williams, 

 with an introduction by Roland Duer Irving. 1*^.90. 8^=. 241 pp. 16 pi. Price 30 cents. 



63. A Bibliography of Paleozoic Crustacea from 1698 to 1889, including a list of North Amer- 

 ican species and a systematic arrangement of genera, by Anthony W. Vogdes. 18J0. 8°. 177 pp. 

 Price 15 cents. 



64. A Report of work done in the Division of Chemistry and Physics, mainly during the fiscal 

 year 1888-'89. F. W. Clarke, chief chemist. 1890. S=. 60 pp". Price 10 cents. 



(>5. Stratigraphy of the Bituminous Coal Field of Pennsvlvania, Ohio, and West Virginia, by 

 Israel C. White. 1891. 8°. 2U pp. 11 pi. Price 20 cents. 



66. On a Group of Volcanic Rocks from the Tewan Mountains, New Mexico, and on the occurrence 

 of Primary Quartz in certain Basalts, by Joseph Paxson Iddings. 1890. 8°. 34 pp. Price 5 crnls. 



67. The relations of the Traps of the Newark System in the New Jersey Region, by Nelson Horatio 

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68. Earthquakes in California in 1869, by James Edward Keeler. 1890. 8^. 25 pp. Price5cents. 



69. A Classed and Annotated Bibliography of Fossil Insects, by Samne! Hubbard Scudder. 1890. 

 S°. 101 pp. Price 15 cents. 



70. Report on Astronomical Work of 1889 and l'-90, by Robert Simpson Woodward. 1890. 8°. 

 79 pp. Price 10 cents. 



71. Index to the Known Fossil Insects of the World, including Myriapods and Arachnids, by 

 Saninel Hubbard Scudder. 1891. 8^. 744 pp. Price 50 cents. 



72. Altitudes between Lake Superior and the Rocky Mountains, by Warren Uphani. 1891. 8°. 

 229 pp. Price 20 cents. 



73. The Viscosity of Solids, by Carl Barns. 1891. 8=. xii, 139 pp. 6 pi. Price 15 cents. 



74. The Minerals of North Carolina, by Frederick Augustus Genth. 1891. 8°. 119 pp. Price 

 15 cents. 



75. Record of North American Geology for 1887 to 1889, inclusive, by Nelson Horatio Darton. 

 1891. 8-. 173 pp. Price 15 cents. 



76. A Dictionary of Altitudes in the United States (second edition), compiled by Henry Gannett, 

 chief topographer. 1891. 8^. 393 pp. Price 25 cents. 



77. The Texan Permian and its Mesozoic types of Fossils, by Charles A. White. 1891. 8°. 51 

 pp. 4 pi. Price 10 cents. 



78. A report of work done in the Division of Chemistry and Phvsics, iliainlv during the fiscal year 

 1889-'90. F. W. Clarke, chief chemist. 1891. 8'^. 131 pp. Price 15 cents. 



79. A Late Volcanic Eru)>tion in Northern California and its peculiar lava, by J. S. Diller. 



80. Correlation papers — Devonian and Carboniferous, by Henry Shaler Williams. 1891. 8°. 

 279 pp. Price 20 cents. 



81. Correlation papers — Cambrian, by Charles Doolittle Walcott. 1891. 8°. ^47 pp. 3 pi. 

 Price 25 cents. 



82. Correlation papers— Cretaceous, by Charles A. White. 1891. 8°. 273 pp. 3 pi. Price 

 20 cents. 



83. Correlation papers— Eocene, by William Bullock Clark. 1891. 8^. 173 pp. 2 pi. Price 15 

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91. Record of North American Geology for 1890, by Nelson Horatio Darton. 1891. 8°. 88 pp. 

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