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45. The Present Condition of Knowledge of the Geology of Texas, by Robert T. Hill. 1887. 8". 94 

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46. Niiture and Origin of Deposits of Phosphate of Lime, by It. A. F. Penrose, jr., witli 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. On the Form and Position of the Sea Level, by Robert Simpson Woodward. 1888. 8=. 88 pp. 

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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 Wood- 

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51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiatbar White. 1889. S°. 102 pp. 



14 pi. Price 15 cents. 



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

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

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54. On the Thermo-Electrio Measurement of High Temperatures, by Carl Barns. 1889. 8^. 313 pp. 

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

 188G-'87. Frank Wigglesworth Clarke, chief chemist. 1889. 8°. 9C pp. Price 10 cents. 



56. Fossil Wood and Lignite of the Potomac Fonuation, by Frank Hall Knowltou. 1889. 8°. 72 pp. 

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57. A Geological Reconnaissance in Southwestern Kansas, by Robert Hay. 1890. 8'^. 49 pp. 2 pi. 

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

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

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60. Reportof work done in the Division of Chemistry and Physics, mainly dui'iug 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 Waldemar 

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62. The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan; a contri 

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 with an introduction by Roland Duer Irving. 1890. 8^. 241 pp. 16 pi. Price 30 cents. 



63. A Bibliography of Paleozoic Crustacea from 1098 to 1889, including a list of North American 

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

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65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, aud West Virginia, by Israel 

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66. On a Group of Volcanic Rocks from the Towan Mountains, New Mexico, and on the occurrence 

 of Primary Quartz in certain Basalts, by Josepli Paxson Iddings. 1890. 8°. 34 pp. Price 5 cents. 



67. The Relations of the Traps of the Newark Sj'stem in the New Jersey Region, by Nelson Horatio 

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



69. A Classed and Annotated Bibliography of Fossil Insects, by Samuel Hubbard Scudder. 1890. 

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70. Report on Astronomical Work of 1889 and 1890, by Robert Simpson Woodward. 1890. 8'^. 79 pp. 

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71. Index to the Known Fossil Insects of the World, including Myriapods and Araclinids, by Samuel 

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72. Altitudes between Lake Superior and the Rooky Mountains, by Warren Upham. 1891. 8°. 

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



74. The Minerals of North Carolina, by Frederick Augustus Genth. 1891. 8°. 119 pp. Price 15 

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75. Record of North American Geology for 1887 to 1889, inclusive, hy Nelson Horatio Darton. 1891. 

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

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77. The Texan Permian and its Mesozoic Types of Fus.sils, by Charles A. White. 1891. 8°. 51 pp. 

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