IV ADVERTISEMENT. 



43. Tertiary and Cretaceous Strata of the Tuscaloosa, Tombigbee, and Alabama Rivers, by Eugene 

 A. Smith iinfl Lawrence C. .Johnson. 1887. 8^. 189 pp. 21 pi. Price 15 cents. 



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

 Price 5 cents. 



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

 94 pp. Price 10 cents. 



46. Nature and Origin of Deposits of Pho.sph.ale of Lime, by R. A. V. Penrose, jr.. with an Intro- 

 duction by N. S. 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 

 10 cents. 



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

 pp. Price 10 cents. 



49. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New Mexico, by Robert 

 Simpson Woodward. 1889. 8°. 133 ]ip. Price 15 cents. 



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

 Woodward. 1889. 8°. 124 pp. Price 15 cents. 



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

 pp. 14 pi. Price 15 cents. 



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

 CookRnssell. 1889. 8°.' 65 pp. 5 pi. Price 10 cents. 



53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 1889. 8. n.". iip. 1(1 pi. Price 

 10 cents. 



54. On the Thermo-Electric Measurement of High Temperatures, by Carl l!;uiis 1889. 8 '. 

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



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

 year 1886-'87. Frauk Wigglesworth Clarke, chief chemist. 1889. 8'\ 96 pp. Price 10 cents. 



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

 72 pp. 7 1)1. Price 10 cents. 



57. A Geological Reconnoissance in Southwestern Kansas, by Robert Hay. 1890. 8 . 49 pp. 

 2 pi. Price 5 cents. 



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

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

 pp. iucl. 1 pi. 8 pi. Price 15 cents. 



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

 pp. 1 pi. Price 10 cents. 



GO. 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 AViUiam Harlow Melville aud Wal- 

 demar Lindgreu. 1890. 8"^. 40 pp. 3 pi. Price 5 cents. 



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

 tribution to the subject of dynamic metamorphism in eruptive rocks, by George Huntington Williams, 

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



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

 ican 8])ccies and a systematic arrangement of genera, by Anthony W. Vogdes. 1890. 8^ . 177 pp. 

 Price 15 cents. 



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

 year 18S8-'89. F. W. Clarke, chief chemist. 1890. 8'^. 60 pp. Price 10 cents. 



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

 Israel C. White. 1891. 8^'. 212 pp. 11 pi. Price 20 cents. 



60. On a Group of A^olcanic Rocks from the Tewan Mountains, New Mexico, and on the occur- 

 rence of Primary Quartz in certain Basalts, by Joseph Paxson Iddings. 1890. 8 . 34 pp. Price 5 

 cents. 



67. The Relations of the Traps of the Newiirk Sy.stem iu the New Jersey Region, by Nelson 

 Horatio Darton. 1890. 8 '. 82 pp. Price 10 cents. 



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

 cents. 



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

 8°. 101 pp. Price 15 cents. 



70. A report on .\8tronomical Work of 1889 aud 1890, by Robert Simpson Woodward. 1890. 8^. 

 79 pp. Price 10 cents. 



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

 Samuel Hubbard Scudder. 1891. 8"^. 744 pp. Price .50 cents. 



72. Alfitiules between Lake Supcri(U- and the Rocky Mountains, by Warrcii Iphaiu. 1.S9I. S . 

 229 pp. Price 20 cents. 



73. The Viscosity of Solids, by Carl Barns. 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 cents. 



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

 1891. 8'-'. 173 i>p. Price 15 cents. 



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

 chief topographer. 1891. 8-. 393 \i\>. Price 25 cents. 



