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•in. Tertiary aud Cretaceous Strata of the Tuscaloosa, Tombigbee, and Alabama Rivers, by Eugene 

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44. i^ililiography of North American Geology for 1886, by Nelson H. Darton. 1887. 8*^. 35 pp. 

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45. TIic Present Condition of Knowledge of the Geology of Texas, liy Robert T. Hill. 1887. 8". 

 94 pp. Price 10 cents. 



46. Nature and Origin of DcpositH of Phosi)hate of Lime, by R. A. F. Penrose, jr., with an Intro- 

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

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48. On the Form and Position of the Sea Level, by Robert Simpson Woodward. 1888. 8^. 88 

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49. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New 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 Abiathur White. 1889. 8'\ 102 

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.52. Subai'rial Decay of Rocks and Origin of the Red Color of Certain Formations, by Israel 

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53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 1889. 8^-. 55 pp. 10 pi. Price 

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

 313 pp., iucl. 1 pi. 11 pi. Price 25 cents. 



.55. Report of work done in the Division of Chemistry and Physics, mainly during thl^ fiscal 

 year 1886-'87. Frank Wigglesworth Clarke, chief chemist. 'l889. 8°.' 96 pp. Price 10 cents. 



56. Fossil Wood and Lignite of the Potomac Formation, by Frank Hall Kuowlton. 1889. 8' . 

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57. A Geological Jieconnoissance in Southwestern Kansas, by Robert Hay. 1890. 8 . 49 pj). 

 2 pi. Price 5 cents. 



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

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.59. The Gabbros and Associated Rocks in Delawaie, 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 1887-'88. 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- 

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

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 \vith an introduction by Robnid Doer Irving. 1890. 8". 241pp. 16 pi. Price 30 cents. 



63. A P.ibliogr.ipiiy 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 Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by 

 Israel ('. White. 1891. 8°. 212 pp. 11 pi. Price 20 cents. 



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

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67. The relations of the Traps of the Newark System in the New Jersey Region, by Nelson 

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68. Earthquakes in California in 1889, by James Edward Keeler. 1890. 8°. 25 p)). Price 5 

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69. A Classed and Annotated Biography of Fossil Insects, by Samuel Howard Scudder. 1890. 

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70. A Report on Xstrouomical Work of 1889 and 1890, by Rolx^rt Simpson Woodward. 189(1. 8'-. 

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71. Index to the Known Fossil Insects of the World, including Myriapods aud Arachnids, by 

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72. Altitudes between Lake Superior aud the Rocky Mountains, by Warren Upham. 1891. 8". 

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73. Tlie Viscosity of Solids, by Carl Barus. 1891. 8^^. xii, 139 i)p. 6 pi. Price 15 cents. 



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

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75. Record of North American Gi ology for 1887 to 18S9, inclusive, by Nelson Horatio Darton. 

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76. A Dictionary of Altitudes in the United States (second i-dition), compiled by Henry Gannett, 

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