IV ADVERTISEMENT. 



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

 Simpson Woodward. 1889. 8. 133 pp. Price 15 cents. 



50. Formulas and Tables tu facilitate the Construction and Use of Maps, by Robert Simpson 

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



51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiatliar Wbite. 1889. 8 C . 102 

 pp. 14 pi. Pric-e 15 cents. 



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

 Russell. 18>9. ,- . 65pp. 5 pi. Price 10 cents. 



63. The Geology of Nantncfcet, by Nathaniel SonthgateShaler. 1889. 8. 55pp. 10 pi. Price 

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

 313pp. iucl. 1 pi. 11 pi. Price 25 "cents. 



55. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal jcar 

 1886-'87. Frank Wigglesworth Clarke, chief chemist. 1889. 8. '96pp. Price 10 cents. 



56. Fossil Wood and Lignite of the Potomac Formation, by Frank Hall Ktiowlton. 1889. s . 

 72 pp. 7 pi. Price 10 cents. 



57. 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. 



59 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-'88. 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 Limlgren. 1890. 8. 40pp. 3 pi. Price 5 cents. 



62. The Greenstone Schist Areas of the Meuominee and Marqnette Regions of Michigan, a contri- 

 bution to the subject of dynamic metamorphism in eruptive rocks, by George Hmitiugton 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. 18!tO. 8. 177 pp. 

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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. 8. 60pp. Price 10 cents. 



65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by 

 Israel C. White. 1891. 8. 21<i 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 cents. 



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

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68. Earthquakes in California in li-89, by James Edward Keeler. 1890. 8. 25pp. Price5 cents. 



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

 8. 101 pp. Price 15 cents. 



70. Report on Astronomical Work of 1889 and 1890, by Robert Simpson Woodward. 1890. 8. 

 79pp. Price 10 cents. 



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

 Samuel Hubbard Scudder. 1891. 8. 744pp. Price 50 cents. 



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

 229 pp. Price 20 cents. 



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



74. The Minerals of North Carolina, by Frederick Augustus Genth. 1891. 8. 119pp. 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. 393pp. 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 Physics, mainly during the fiscal year 

 1889-'90. F. W. Clarke, chiet chemist. IS'.lt. 8. 131 pp. Price 15 cents. 



79. A Late Volcanic. Eruption 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. 1S91. 8. 447 pp. 3 pi. 

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

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83. Correlation papers Eocene, by William Bullock Clark. 1891. 8. 173pp. 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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