IV ADVERTISEMENT. 
17. On the Development of Crystallization in the Igneous Rocks of "Washoe, Nevada, with Notes on 
the Geology of the District, by Arnold Hague and Joseph P. Iddings. 1885, 8°. 44 pp. Price 5 
cents. 
18. On Marine Eocene, Fresh- water Miocene, and Other Fossil Mollusca of "Western North America, 
by Charles A. White. 1885. 8°. 26 pp. 3 pi. Price 5 cents. 
19. Notes on the Stratigraphy of California, by George F. Becker. 1885. 8°. 28 pp. Price 5 cents. 
(Exhausted.) 
20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W. F. Hille- 
brand. 1885. 8°. 114 pp. 1 pi. Price 10 cents. 
21. The Lignites of the Great Sioux Reservation. A Report on the Region between the Grand and 
Moreau Rivers, Dakota, by Bailey Willis. 1885. 8°. 16 pp. 5 pi. Price 5 cents. 
22. On New Cretaceous Fossils from California, by Charles A. White. 1885. 8°. 25 pp. 5 pi. 
Price 5 cents. 
23. Observations on the Junction between the Eastern Sandstone and the Keweenaw Series on 
Keweenaw Point, Lake Superior, by R. D. Irving and T. C. Chamberlin. 1885. 8°. 124 pp. 17 pi. 
Price 15 cents. 
24. List of Marine Mollusca, comprising the Quaternary Fossils and Recent Forma from American 
Localities between Cape Hatteras and Cape Roque, including the Bermudas, by William Healy Dall. 
1885. 8°. 336 pp. Price 25 cents. 
25. The Present Technical Condition of the Steel Industry of the United States, by Phineas Barnes. 
1885. 8°. 85 pp. Price 10 cents. 
26. Copper Smelting, by Henry M. Howe. 1885. 8°. 107 pp. Price 10 centa. 
27. Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal Year 
1884-'85. 1886. 8°. 80 pp. Price 10 cents. 
28. The Gabbros and Associated Hornblende Rocks occurring in the Neighborhood of Baltimore, 
Maryland, by George Huntington Williams. 1886. 8°. 78 pp. 4 pi. Price 10 cents. 
29. On the Fresh- water Invertebrates of the North American Jurassic, by Charles A. White. 1886. 
8°. 41pp. 4 pi. Price 5 cents. 
30. Second Contribution to the Studies on the Cambrian Faunas of North America, by Charles Doo- 
little Walcott. 1886. 8°. 369 pp. 33 pi. Price 25 centa. 
31. Systematic Review of our Present Knowledge of Fossil Insects, including Myriapods and Arach- 
nids, by Samuel Hubbard Scudder. 1886. 8°. 128 pp. Price 15 cents. 
32. Lists and Analyses of the Mineral Springs of the United States ; (a Preliminary Study), by Alhert 
C. Peale. 1886. 8°. 235 pp.. Price 20 cents. 
33. Notes on the Geology of Northern California, by J. S. Diller. 1886. 8°. 23 pp. Price 5 cents. 
34. On the Relation of the Laramie Molluscan Fauna to that of the Succeeding Fresh-water Eocene 
and Other Groups, by Charles A. White. 1886. 8°. 54 pp. 5 pi. Price 10 cents. 
35. Physical Properties of the Iron-Carbureta, by Carl Barus and Vincent Strouhal. 1886. 8°. 62 
pp. Price 10 cents. 
36. Subsidence of Fine Solid Particles in Liquids, by Carl Barua. 1886. 8°. 58 pp. Price 10 centa. 
37. Typea of the Laramie Flora, by Leater F. Ward. 1887. 8°. 354 pp. 57 pi. Price 25 cents. 
38. Peridotite of Elliott County, Kentucky, by J. S. Diller. 1887. 8°. 31 pp. 1 pi. Price 5 centa. 
39. The Upper Beaches and Deltaa of the Glacial Lake Agaaaiz, by Warren Upham. 1887. 8°. 84 
pp. lpl. Price 10 centa. 
40. Changes in River Coursea in Washington Territory due to Glaciation, by Bailey Willis. 1887. 
8°. 10 pp. 4 pi. Price 5 cents. 
41. On the Fossil Faunas of the Upper Devonian— the Genesee Section, New York, by Henry S. 
Williams. 1887. 8°. 121pp. 4 pi. Price 15 cents. 
42. Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal Year 
1885-'86. F. W. Clarke, Chief Chemist. 1887. 8°. 152 pp. lpl. Price 15 cents. 
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 pi. Price 15 centa. 
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 Poaition of the Sea Level, by Robert Simpaon Woodward. 1888. 8°. 88 pp. 
Price 10 centa. 
49. Latitudea and Longitudes of Certain Pointa in Miaaouri, Kansas, and New Mexico, by Robert 
Simpson Woodward. 1889. 8°. 133 pp. Price 15 cents. 
50. Formulas and Tablea to facilitate the Construction and Uae of Mapa, by Robert Simpaon Wood- 
ward. 1889. 8°. 124 pp. Price 15 cents. 
