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51. On Iiiv»M-M>rato Fossils from tlio Pacific Coaat, l.y ("liarlos Al.iatliar While. 1889. 8'^. 102 

 pp. 14 pi. Price 15 cciit.s. 



52. Subacrial Decay of Kocks and Origin of tlio lied O.ilor i.f (."ertain Forinallons, by Israel Cook 

 KiLssell. 1S89. 8^. 65 pp. 5 pi. Prices 10 centa. 



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



cents. 



54. On the Thernio-Electric Measuremout of High Temperatures, by Uarl Barus. 1889. 8^. 313 pi>. 



incl. 1 pi. 11 pi. Price 25 cents. 



55. Report of Work douo in the Division of Chemistry and Phy.sics, mainly during the Fiscal Year 

 1886^'87. Frank Wigglcswortli Clarke, Chief Chemist. 1889. 8°. 90 pp. Price 10 cents. 



56. Fossil Wood and Lignite of the Potoma<-. Formation, by Frank Hall Knowlton. 1889. 8\ 72 



pp. 7 pi. Price 10 cents. 



57. A Geological Reconnaissance iu Southwestern Kausius, by Robert ITay. 1890. »\ 49 pp. 2 jd. 



Price 5 cents. 



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

 Frederick Wright with ;ui Introduction by Thomas ChrowderChaniberlin. 1,S90. 8^. 112 pp. 8 pi. 



Price 15 cents. 



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



Ipl. Price 10 cents. 



60. Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal Year 

 1887-88. F. W. Clarke, Chief ( heraist 1890. 8°. 174 pp. Price 15 cents. 



61. Contributions to the Mineralogy of the Pacific Coast, by William Harlow Melville and Waldemar 

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



62.'The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan ; a Contri- 

 bution to the Subject of Dynamic :sretiraorphi8m in Eruptive Rocks, by George Huntington Williams; 

 with an Introduction by Roland Diier Irving. 1890. 8°. 241pp. 10 pi. Price 30 cents. 



63. A Bibliography of Paleozoic Crustacea from 1698 to 1889, including a List of North American 

 Species and a Systematic Arrangement of Genera, by Anthony W.Vogdes. 1890. 8°. 177 pp. Price 



15ccnts. 



64. A Report of Work done in the Division of Chemistry and Physics, mainly during the 1 iscal 

 Year 1888- '89. 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 Israel 

 C. White. 1891. 8°. 212 pp. 11 pi. Price 20 cents. 



60. On a Group of Volcanic Rocks from the Tewan Mountains New Mexico, and on the Occurrence 

 ol Primary Quirtz in Certaiu Basalts, by Joseph Paxsou Iddings. 1890. 8°. 34 pp. Price 5 cents. 



67. The Relations of the Traps of the Newark System 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 .-.ents. 

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



8°. 101 pp. Price 15 cents. 



70. ReportonA8tronomicalWorkofl889andl890, 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. Altitudes between Lake Superior and the Rocky Mountains, by Warren Upham. 1891. 8°. 



229 pp. Price 20 cents. 



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



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



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



8°. 173 PI). Price 15 cents. 



76. A. Dictionary of Altitudes iu the United States (Second Kdition), compiled by Henry Gannett, 

 Chief Topographer. 1891. 8°. 393 pp. Price 25 cents. 



77. The Texan Permian and its Mesozoic Types of Fossils, by Charles A. White. 1891. 8c. 51 pp. 



4 pi. Price 10 cents. 



78. A Ueport of Work done in the Division of Chemistry and Physics, mainly during tli(* 1 iscal 

 Year 1889-'90. F. W. Clarke, Chief Chemist. 1891. S°. 131 pp. Price 15 cents. 



79. A Late Volcanic Eruption in Northern California and its Peculiar Lava, by J. S. Diller. 1891. 8°. 



:;:i pp. 17 jd. Price 10 cents. 



80. Correlation Papers— Devonian and Carboniferous, by Henry Shaler Williams. 1891. 8^. 279 pp. 



Price 20 cents. 



81. Correlation Papers-Cambrian, by Charles Doolittle Walcott. 1891. 8^ 447 pp. 3 pi. Price 



25 cents. 

 82 Correliition Papers-Cretaceous, by Charles A. White. 1891. 8^. 273 pp. 3 pi. Price 20 cents. 

 83. Correlation Papers-Eoceue, by William Bullock Clark. 189L 8°. 173 pp. 2 pi. Price 15 cents. 



