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 to facilitate the Construction and Use of Maps, by Robert Simpson 
Woodward. 1889. 8°. 124 pp. Price 15 cents. 
51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiathar White. 1889. 8°. 102 
pp. 14pl. Price 15 cents. 
52. Subaérial Decay of Rocks and Origin of the Red Color of Certain Formations, by Israel Cook 
Russell. 1889. 8°. 65 pp. Spl. Price 10 cents. 
53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 1889. 8°. 55 pp. 10 pl. Price 
16 cents. 
54. On the Thermo-Electric Measurement of High Temperatures, by Carl Barus. 1889. 8°. 
313 pp. incl. 1 pl. 11 pl. Price 25 cents. 
55. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 
1886~87. 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 pl. Price 10 cents. 
57. A Geological Reconnaissance in Southwestern Kansas, by Robert Hay. 1890. 8°. 49 pp. 
2 pl. 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 pl. 8pl. Price 15 cents. 
59. The Gabbros and Associated Rocks in Delaware, by Frederick D.Chester. 1890. 8°. 45 pp. 
1 pl. Price 10 cents. . 
60. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 
188788. 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. 3pl. PriceScents.  — 
62. The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, a contri- 
bution to the subject of dynamic metamorphism in ernptive rocks, by George Huntington Williams, 
with an introduction by Roland Duer Irving. 1°90. 8°. 241 pp. 16 pl. 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. 1890. 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. 1:90. 8°. 60 pp. Price 10 cents. 
65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by 
Israel C. White. 1891. 8°. 212 pp. 11 pl. 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 in the New Jersey Region, by Nelson Horatio 
Darton. 1*90. 8°. 82pp. Price 10 cents. 
68. Earthquakes in California in 1489, by James Edward Keeler. 1890. 8°. 25 pp. Priced 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. &°. 
79 pp. Price 10 cents. 
71. Index to the Kuown Fossil Insects of the World, including Myriapods and Arachnids, by 
Samuel Hubbard Scudder. 1891. 8°. 744 pp. Price 50 cents. 
72. Altitudes between Lake Superior and the Rocky Mountains, by Warren Upham. 1891. 8°. 
929 pp. Price 20 cents. 
73. The Viscosity of Solids, by Carl Barus. 1891. 8°. xii, 139 pp. 6 pl. 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. 4pl. Price 10 cents. | 
78. Areport of work done in the Division of Chemistry and Physics, mainly during the fiscal year 
1889-90. F. W. Clarke, chief chemist. 1891. 8°. 131 pp. Price 15 cents. 
79. A Late Voleanic Eruption in Northern California’and its peculiar lava, by J. 8. 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. 1&91. 8°. 447 pp. 3 pl. 
Price 25 cents. 
82. Correlation papers—Cretaceous, by Charles A. White. 1891. 8°. 273 pp. 3 pl. Price 
20 cents. 
83. Correlation papers—Eocene, by William Bullock Clark. 1891. 8°. 173 pp. 2pl. Price 15 
cents. 
91. Record of North American Geology for 1890, by Nelson Horatio Darton. 1891. 8°. &8 pp. 
Price 10 cents. . . 
