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43. Tertiary and Cretaceous strata of Hie Tuscaloosa, Tombigbee, and Alabama Rivers, by Eugene 

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44. Bibliography of North American Geology tor 1886, by Nelson H. Darton. 1887. 8< . 35 pp. 

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45. The Present Condition of Knowledge of the Geology of Texas, by Robert T. Hill. 1887. 8 . 

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46. Nature ami Origin of Deposits of Phosphate of Lime, bv R. A. P. Penrose, jr.. with an Intro- 

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47. Analyses of Waters of the Yellowstone National Park, with an Account of the Methods of 

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48. <>n the Form and Position of the Sea Level, by Robert Simpson Woodward. 1888. 8°. 88 

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49. Latitudes and Longitudes of ( lertain Points in Missouri, Kansas, and Xew Mexico, by Robert 

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50. Formulas and Tables to Facilitate the Construction and Use of Maps, by Robert Simpson 

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51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiathar White. 1889. 8°. 102 

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52. Subaerial Decay of Rocks and Origin of the lied Color of Certain Formations, by Israel 

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53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 188;). 8°. 55 pp. 10 id. Price 



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54. On the Thermo-Electric Measurement of High Temperatures, by Carl Barus. 1889. 8 . 

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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. 90 pp. Price lo cents. 



56. Fossil Wood and Lignite of the Potomac Formation, hy Frank Hall Knowlton. 1889. 8 . 

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57. A Geological Reconnoissance iu Southwestern Kansas, by Robert Hay. 1890. 8 . 19 pp. 

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58. The Glacial Boundary in Western Pennsylvania. Ohio, Kentucky, Indiana, and Illinois, by 

 George Frederick Wright, witli an introduction by Thomas Chrowder Chamberlin. 1890. 8°. 112 

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59. The Gabbros and Associated Rocks in Delaware, by Frederick D.Chester. 1890. 8 . 45 

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60. Report of work done in the Division of Chemistry and Physics, mainly during the fiscal 

 year*887-'88, F. W. Clarke, chief chemist. 1890. 8°. 174 pp. Price 15 :ents. 



61. Contributions to the Mineralogy of the Pacific Coast, by William Harlow Melville and Wal- 

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62. The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, a con 

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63. A Bibliography of Paleozoic Crustacea from 1698 to 1889, including a list of North Amer- 

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64. A Report of work done in the Division of Chemistry and Physics, mainly during the fiscal 

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65. Stratigraphy of the Bitumiuous Coal Field of Pennsylvania, Ohio, and West Virginia, by 

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66. On a Group of Volcanic Rocks from the Tewan Mountains. Xew- Mexico, and on the occur- 

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67. The relations of the Traps of the Newark System iu the Xew Jersey Region, by Nelson 

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us. Earthquakes in California in 1889, by James Edward Keeler. 1890. 8 . 25 pp. Price 5 

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09. A Classed and Annotated Biography of Fossil Insects, by Samuel Howard Scuddor. 1890. 

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70. A Report on Astronomical Work of 1889 and 1890, by l.'ol.ert Simpson Woodward. 1890. 8 . 

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71. Index to the Known Fossil Inse.ts of the World, including Myriapods and Arachnids, by 

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72. Altitudes between Pake Superior and the Rocky Mountains, by Warren Upham. 1891. 8 . 

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73. The Viscosity of Solids, by Carl Barus. 1891. 8°. xii, 139pp. 6 pi. Price 15 cents. 



74. The Minerals of North Carolina, by Frederick Augustus Genth. 1891. 8°. 119 pp. Price 

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75. Record of North American Geologj for 1887 t" 1889, inclusive, bj Kelson Horatio Darton. 

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76. A Dictionary of Altitudes in the l aiteu States (second edition I, compiled by Henry Gannett, 

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