IV ADVERTISEMENT. 
43. Tertiary and Cretaceous Strata of the Tuscaloosa, Tombigbee, and Alabama Rivers, by Eugene 
A. Smith and Lawrence C. Johnson. 1887. 8°. 189 pp. 21 pl. Price 15 cents. 
44. Bibliography of North American Geology for 1886, by Nelson H. Darton. 1887. 8°. 35 pp. 
Price 5 cents. 
45. The Present Condition of Knowledge of the Geology of Texas, by Robert T. Hill. 1887. 8°. 
94 pp. Price 10 cents. 
46. Nature and Origin of Deposits of Phosphate of Lime, by R. A. F. Penrose, jr., with an Intro- 
duction by N.S. Shaler. 1888. 8°. 143 pp. Price 15 cents. 
47. Analyses of Waters of the Yellowstone National Park, with an Account of the Methods of 
Analysis employed, by Frank Austin Gooch and James Edward Whitfield. 1888. 8°. 84 pp. Price 
10 cents. 
48. On the Form and Position of the Sea Level, by Robert Simpson Woodward. 1888. 8°. 8& 
pp. Price 10 cents. 
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°. 65pp. 5 pl. Price 10 cents. 
53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 1889. 8°. 55 pp. 10 pl. Price 
10 cents. 
54. On the Thermo-Electric Measurement of High Temperatures, by Carl Barus. 1889. 8°. 
313 pp.,inel.1 pl. 11 pl. Price 25 cents. 
55. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal 
year 188687. 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. Tpl. Price 10 cents. 
57. A Geo.ogical Reconnoissance in Southwestern Kansas, by Robert Hay. 1890. 8°. 49 pp. 
2pl. Price 5 cents. 
58. 'The Glacial Boundary in Western Pennsylvania, Ohio, Kentucky, Indiana, and Ilinois, by 
George Frederick Wright, with an introduction by Thomas Chrowder Chamberlin. 1890, 8°. 112 
pp.inel.1 pl. 8 pl. Price 15 cents. : 
59. The Gabbros and Associated Rocks in Delaware, by Frederick D. Chester. 1890. 8°. 45 
pp. ipl. 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. Price 5 cents. 
62, The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, a con- 
tribution 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 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. EF. 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 C. White. 1891. 8°. 212 pp. l11pl. Price 20 cents. 
66. On a Group of Voleanic Rocks from the Tewan Mountains, New Mexico, and on the occur- 
rence of Primary Quartz in certain Basalts, by Joseph Paxson Iddings. 1890, 8°. 34pp. Price5 
cents. 
67. The relations of the Traps of the Newark System in the New Jersey Region, by Nelson 
Horatio Darton. 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 Biography of Fossil Insects, by Samuel Howard Seudder. 1890. 
8°. 101 pp. Price 15 cents. 
70. A Report on Astronomical Work of 1889 and 1890, 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 
Samuel Hubbard Scudder. 1891. 8°. 744 pp. 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 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. 
