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in the Igneoiis Rocks of Washoe, Nevada, with Notes on the 

 Geology of the District, by A. H. and J. P. Iddings. 1885; No. 18. 

 On Marine Eocene, Fresh-water Miocene, and other Fossil Mollusca 

 of Western North America, by C. A. White. 1885; No. 19. Notes 

 on the Stratigraphy of California, by G. F. Becker. 1885; No. 20. 

 Contributions to the Mineralogy of the Rocky Mountains, by Wh. 

 Gross and W. F. Hillebrand. 1885; No. 21. The Lignites of the 

 Great Sioux Reservation. A Report on the Region between the 

 Grand and Moreau Rivers, Dakota, by B, Willis. 1885; No. 22. 

 On New Cretaceous Fossils from California, by Ch. A. White. 

 1885; No. 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: No. 24. 

 List of Marine Mollusca, comprising the Quaternary Fossils and 

 recent forms from American Localities between Cape Hatteras and 

 Cape Roque, including the Bermudas, by W. H. Dali. 1885; No. 25. 

 The Present Technical Condition of the Steel Industry of the Uni- 

 ted States, by Ph. Barnes. 1885; No. 26. Copper Smelting, by 

 Henry M. Howe. 1885; No. 27. Report of work done in the Di- 

 vision of Chemistry and Physics , mainly during the fiscal year 

 1884 — 85. 1886; No. 28. The Gabbros and Associated Hornblende 

 Rocks occurring in the Neighborhood of Baltimore, Md., by G, H. 

 Williams. 1889 ; No. 29. On the Fresh-water Invertebrates of the 

 North American Jurassic, by Ch A. White. 1886; No. 30. S^cond 

 Contribution to the Studies on the Cambrian Faunas of North 

 America, by Ch. D. Walcott. 1886; No. 31. Systematic Review of 

 our Present Knowledge of Fossil Insects, including Myriapods and 

 Arachnids, by S. H. Scudder. 1886; No. 32. Lists and Analyses 

 of the Mineral Springs of the United States ; a Preliminary Study, 

 by A. C. Peale. 1886; No. 33. Notes on the Geology of Northern 

 California, by J. S. Diller. 1886; No. 34. On the relation of the 

 Laramie Molluscan Fauna to that of the succeeding Fresh-water 

 Eocene and other groups, by Ch. A. White. 1886; No. 35. Phy- 

 sical Properties of the Iron Carburets, by C. Barus and V. Strouhal. 

 1886 ; No. 36. Subsidence of Fine Solid Particles in Liquids, by 

 C. Barus. 1886; No. 37. Types of the Laramie Flora, by L F. Ward. 

 1887; No. 38. Peridotite of Elliott County, Kentucky, by J. S. 

 Diller. 1887; No. 39. The Upper Beaches and Deltas of the Glacial 

 Lake Agassiz, by W. Upham. 1887; No. 40. Changes in River 

 Courses in Washington Territory due to Glaciation, by B. Willis. 

 1887; No. 41. On the Fossil Faunas of the Upper D(^vonian — ihe 

 Genesee Section , New York by H. S. Williams. 1887; No. 42. 

 Report of work done in the Division of Chemistry and Physics, 

 mainly during the fiscal year 1885—86. F. W. Clarke. 1887; 

 No. 43. Tertiary and Cretaceous Strata of the Tuscaloosa, Tuni- 

 bigbee, and Alabama Rivers, by E. A. Smith and L. C. Johnson. 

 1887; No. 44. Bibliography of North American Geology for 1886, 

 by N. H. Darton. 1887; No. 45. The Present Condition of Kuuw- 



