IV ADVERTISEMENT. 
44. Bibliography of North American Geology for 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°. 
94 pp. Price 10 cents. 
16. Nature and Origin of Deposits of Phosphate of Lime, by R. A. F. Penrose, jr., with an Intro- 
duction by N.8.Shaler. 1888. 8°. 143 pp. Price 15 cents. 
47. Analyses of Waters of the Yellowstone National Park, with an Account of the Methods of 
Analysis employed, by Frank Austin Gooch and James Edward Whitfield. 1888. 8°. 84 pp. Price 
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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 Abiathar White. 1889. 8°. 102 
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52. Subaérial 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 pl. 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 188687. Frank Wigglesworth Clarke, chief chemist. 1889. 8°. 96 pp. Price 10 cents. 
56. Fossil Wood and Lignite of the Potomac Formation, by Frank Hall Knowlton. 1889. 8°. 
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57. A Geological Reconnoissance in Southwestern Kansas, by Robert Hay. 1890. 8°. 49 pp. 
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58. The Glacial Boundary in Western Pennsylvania, Ohio, Kentucky, Indiana, and Illinois, by 
George Frederick Wright, with 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 
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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 fiseal 
year 188889. F. W. Clarke, chief chemist. 1890. 8°. 60 pp. Price 10 cents. 
65. Stratigraphy of the Bituminous Coal Field of Pennsylvania, Ohio, and West Virginia, by 
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66. On a Group of Voleanic Rocks from the Tewan Mountains, New Mexico, and on the oceur- 
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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 pp. 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 Astronomical Work of 1889 and 1890, by Robert Simpson Woodward. 1890. 8°. 
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71. Index to the Known Fossil Insects of the World, including Myriapods and Arachnids, by 
Samuel Hubbard Seudder. 1891. 8°. 744 pp. Price 50 cents. 
72. Altitudes between Lake 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, 139 pp. 6 pl. 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 Geology for 1887 to 1889, inclusive, by Nelson Horatio Darton. 
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76. A Dictionary of Altitudes in the United States (second edition), compiled by Henry Gannett, 
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