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44. BiUIioginpby of North Aiueiican Gc(>li>}j,v tor 18><t). by Nelsdii II. I>;irtciii. 1«X7. S-. Sr> pp. 



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4.5. The Present Condition of Knowledge of the Geology of Texas, by Kobirt T. Hill. 1W7. x^. 

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4fi. Nature and Origin of Deposits of Phosphate of Lime, by K. A. F. 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. On the Form and Position of the Sea Level, by Kobert Simpson Woodward. 1888. 8 . 88 

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49. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New Mexico, by L'obert 

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50. Formulas au<l Tables to Facilitate the Construction and Use of Mai)s, by Kobert 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. Subai^rial Decay of Kocks and Origin of the Red Color of Certain Formations, by Israel 

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.53. The (ieology of Nantucket, by Nathaniel Souihgate Shaler. 1889. 8'. 55 pj). 10 pi. Price 



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

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

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.56. Fossil Wood anirLignite of the Potomac Formation, by Frank Hall Kuowlton. 18H9. 8. 

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57. A Geological Reconnoissance in Southwestern Kansas, by Robert Hay. 189(1. 8-. 49 pp. 

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

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.59. The Gabbros and Associated Rocks in Delaware, by Frederick D. Chester. 1X90. 8^. 45 

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60. Report of work done in the Division of tliemistry 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 {'ou- 

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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 w(uk done in the Division of Chemistry and Physics, mainly dining the fiscal 

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

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66. On a Group of Yolcanic 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 pp. Price 5 

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

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70. A Report on Astrcmomical Work of 1889 and 1890, by Robert Simjjson Woodward. 1890. 8 . 

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71. Index to the Known Fossil Insects of the Wiu-ld. including Myriapods and Arachnids, by 

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72. Altitudes between Lake Superior and the Rocky Mountains, by Warren I'pham. 1891. 8". 

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73. The Y'iseosity of Solids, by Carl Barns. 1891. X- . xii, 139 pp. 6 )il. 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 I" 1889, inclusive, by Nel.son Horatio Dartou. 

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76. .V Diclionary of .Mtitudes iu the I'nited States (secimd c<litioii ). conipilcd by Henry Gannett, 

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