ADVERTISEMENT. V 
51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiatbar White. 1889. 8°. 102 
pp. 14 pi. Price 15 cents. 
52. Subaerial Decay of Rocks and Origin of the Red Color of Certain Formations, by Israel Cook 
Kussell. 1889. 8°. 65 pp. 5 pi. Price 10 cents. 
53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 1889. 8°. 55 pp. 10 pi. Price 10 
cents. 
54. On the Thermo-Electric Measurement of High Temperatures, by Carl Barus. 1889. 8°. 313 pp. 
hid. 1 pi. 11 pi. 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 
pj). 7 pi. Price 10 cents. 
57. A Geological Reconnaissance in Southwestern Kansas, by Robert Hay. 1890. 8°. 49 j>p. 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. 8 pi. 
Price 15 cents. 
59. The Gabbros and Associated Rocks in Delaware, by Frederick D.Chester. 1890. 8°. 45 pp. 
lpl. Price 10 cents. 
60. Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal Year 
JB87-'88. F. W. Clarke, Chief Chemist. 1890. 8°. 174 pp. Price 15 cms. 
61. Contributions to the Mineralogy of the Pacific Coast, by William Harlow Melville and Waldemar 
JLindgren. 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. 1890. 8°. 241 pp. 16 pi. Price 30 cents. 
63 A Bibliography of Paleozoic Crustacea from 1698 to 1889, including a List of North American 
Species and a Systematic Arrangement of Genera, by Anthony W. Yogdes. 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, 1890. 8°. 60 pp. Price 10 cents. 
65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by Israel 
€. White. 1891. 8°. 212 pp. 11 pi. Price 20 cents. 
66. On a Group of Yolcanic Rocks from the Tewan Mountains, New Mexico, and on the Occurrence 
ol 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 
iDarton. 1890. 8°. 82 pp. Price 10 cents. 
68. Earthquakes in California in 1889, by James Edward Keeler. 1890. 8°. 25 pp. Price 5 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°. 79 pp. 
iPrice 10 cents. 
71 . Index to the Known Fossil Insects of the World, including Myriapods and A rachnids, by Samuel 
Hubbard Scudder. 1891. 8°. 744 pp. Price 50 cents. 
72. Altitudes between Lake Superior and the Rocky Mountains, by Warren Uphana. 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°. 119 pp. Price 15 
cents. 
75. Record of North American Geology for 1887 to 1889, inclusive, by Nelson Horatio Darton. 1891. 
3°. 173 pp. Price 15 cents. 
76. A Dictionary of Altitudes in the United States (Second Edition), compiled by Henry Gannett, 
1 Dhief 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 
1 pi. Price 10 cents. 
78. A Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal 
rear 1889-90. F. W. Clarke, Chief Chemist. 1891. 8°. 131pp. Price 15 cents. 
79. A Late Volcanic Eruption in Northern California and its Peculiar Lava, by J. S. Diller. 1891. 8°. 
!3pp. 17 pi. Price 10 cents. 
80. Correlation Papers— Devonian and Carboniferous, by Eenry Shaler Williams. 1891. 8°. 279 pp. 
?rice 20 cents. 
81. Correlation Papers— Cambrian, by Charles Doolittle Walcott. 1891. 8°. 447 pp. 3 pi. Price 
!5 cents. 
82. Correlation Papers— Cretaceous, by Charles A. White. 1891. 8 3 . 273 pp. 3 pi. Price 20 cents. 
83. Correlation Papers— Eocene, by William Bullock Clark. 1891. 8°. 173 pp. 2 pi. Price 15 cents. 
