Ill 15. On the Mesozoic ami Ceuozoic Paleontolo<;y of Culiforuia, liy CliarU-s A. Wliitc. 1885. 8°. 33 pp. Price 5 cents.16. On tbe Higher Devonian Fannas of" Ontario County, New York, by .John XI. Clarice. 1885. 8". 8G pp. 3 pi. Price 5 cent.s. 17. On the Development ol' Crystallization in the Igneous Rocks of Washoe, Nevada, with Notes on the Geology of the District, by Arnold Hague and Joseph P. l. :! pi. Price 5 cents.19. NotesontheStratigraphyof California, by George F. Meeker. 1885. 8°. 28i)p. Price5cenl.«. •M. Contributions to tho Mineralogy of the Rocky Mountains, by Wuitiuau Cross and W. F. Hillebrand. Ir^S^. 8^. lU pp. 1 pi. Price 10 cents. 21 . The Lignites of I he Great .Sionx Reservation. A Report on the Region between the Grand and Moreau Rivers, Dakota, by Bailey Willis. 1885. 8'^. If) pp. 5 pi. Price 5 cents. 2. On New Cretaceous Fo.ssils 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 Scries on Keweenaw Point, Lake Superior, by R. D. Irving and T. C. Chamberlin. 1885. 8^. 1-24 pii. 17 pi. Price 15 cents. •24. List of Marine Mollusca, comprising the Quaternary fo.ssils and recent forms Iro'ii Ameiicaii Localities between Cape Hatteras and Cape Roque, including the Bermudas, by William Healey Dall. 1885. 8*^. '33C pp. Price 25 cents. '25. The Present Technical Condition of the Steel Industry of the United States, by Phmcas Barnes. 1885. 8°. 85 pp. Price 10 cents. 26. Copper Smelting, by Henry M. Howe. 1885. 8°. 107 pp. Price 10 cents. 27. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal year 1884-'85. 18^6. S^. 80 pp. Price 10 cents. 28. The Gabbros and As.sociated Hornblende Rocks occnrriug in the Neighborhood .( Baltimore, Md., ov George Huntington Williams. 1881). 8°. 78 pp. 4 pi. Price 10 cents. i'J. On the Fresh-water Invertebrates of the North American Jurassic, by Charles A, White. 188,'). 8°. 41 pp. 4 pi. Price 5 cents. 30. Second Contribuliou to the Studies on the Cambruin Faunas of North America, by Charles Doolittle Walcott. 1-86. 8^. 369 pp. 33 pi. Price "25 cents. 31. Systematic Review of our Present, Knowledge of Fossil Insects, including Myriapods and Arachnids, bv Samuel Hubbard Scudder. 1886. 8^. P28 pp. Price 15 cents. 32. Lists and Analyses of the Mineral Springs of the United States; a Preliminary Study, by Albert C. Peale. 1886. '8°. 2'35 pp. Price 20 cents. 33. Notes on the Geology of Northern California, by J. S.DiUer. 1886. 8°. 23pp. PriceSccnfs. 34. On the relation of the Laramie MoUuscan Fauna to that of the succeeding Fresh-water Eocene and other groniis, bv Clmrles A. White. 1886. 8°. ,54 iip. 5 pi. Price 10 cents. 35. Physical Properties of the Iron-Carburets, by Carl Barns and Vincent Strouhal. 1886. 8°. 62 pp. Price 10 cents. 36. SubsidenceofFin...