IV 
ADVERTISEMENT. 
48. On the Form iind Position of tlio Soa Level, by Robert Simpson Wondvrard. 18^. 8*. 83 pp. 
Pi Ice 10 ueiils. 
40. Latitudes and Limuitades of CerUiii Poinl.s in Missouri. Kansas, and Now Moxkm. by Uobert 
Simpson VToodwanl. 1380. SP. 133 pp. Priei- 15 cents. 
50. Kormubiaand Tablo.sto fneUitaU' tbo ConstnicUoii and ITso of Maps, by Robert Simpson Wood- 
ward S^. 124 pp. rriro 15 centa. ^ 
51. On Invertebrate Fossils fi-oin the Paeific Coast, by CharbfR zUdathm White. 1880. 8*. 103 pp. 
14 pi. Price 15 cents. 
52. Subaerial Decay of Itocks and Origin of the Red Color of Certain ForiiiHiUms. by Israel Cook 
Russell. 18W1. &•'. do pp. 5 pi. Price 10 cents. 
53. The ttcoloii.v of Nantucket, by Nntbauiel S^mllmalc Sbalci. 1880. 8®. 55 pp. 10 pi. Price 10 
cents. 
54. On theTbenno Klectric Mcaaurenjcnt of Hiirli Tempmalui-es. by Carl Barns. 1880. 8®. 313 pp. 
inch 1 )d. 11 pi. Price 25 cents. 
55. Repuft of work »lom* in the Division of Chemistry and Pliysios, mainly during the fiscal year 
1880- 87. Frank Wigglcriwurtli Clarke, chief chemist. 1880. 8®. 90 pit. Price 10 cents. 
50. FoMtl Wood and Lignite of the Potomac Formation, by Frank ilall KmiwUon. 1889. 8^. 72 pp. 
7 pi. Price 10 cents. 
57. zV Geidi'gical Reconnaissance in Soulii western Kansas, by Robert llay. 1890. 8-. 49 pp. 2 pi. 
Price 5 cents. 
58. ThoGlacinl Boundary in Western Pennsylvania, Ohio, Kentiio-ky, Indiana, and Illinois b)’ George 
Ftedoriclc Wriglil, with an introdnc.tioii by TboiiiusChrowdcr Clmmberliii. 1890. 8®. 112 pp. incl. 
1 pi. 8 pi. Price 15 cents. 
59. The Gabbros and zVasociated Rocks In Delaware, by Freilerick D. Chester. 1890. 8®. 45 pp. 
1 pi. Price 10 cents. 
60. Report of work done In the Division of Cbemlslrv and Pli5’slca, mainly during the fiscal year 
1387-'88. F. W. Clarke, chief chomtst. 1890. 8®. 174 pp. Price 15 cents. 
61. Contributions to t he Mineralogy of the Pacilio Coast, by William Harlow Melville and Waldemur 
Lindgren. 1890. 8®. 40 pp. 3 pi. Price 5 cents. 
62. The Greenstone Schist Areas of the Moiioiniuee and Marquette Regions of Michigan j a contri- 
bution to tbo subject of dynamic metamoniUisni in eniptive rocks, by George Huntington AVilliaras: 
with un iiiiroilmitifm by Roland Duer Irving. 18iW. 8®, 241 pp. 16 pi. Price 30 eeiits. 
63. A Bibliogroitliy of Paleozoic Crustacea from 1698 t<i 1889. including a list of North American 
Rpecics and a systemalic airaugemeiif. of genera, by Anthony W. Vogdea. 1890. 8®. 17i pp. Price 
15 cents. 
G4. A Report of work dime fii tlie Division of t’hemistry and Idiysb a, mainly during the fiscal year 
1883- 89. F, W. Clarke, chief chemist. 1890. 8®. 60 pp. Price 10 cents. 
06. On a Gronp of Volcnuic Rocks from the Towuu Mmintains, New Mexico, and on the occurronfo 
of Primary Quartz in certain Ba.salU, by Josepli Piixson Iddings. 1890. 8®. 34 pp. Price 5 ce.nls. 
67. The rebubmaof the Traps of the Newark System in the New Jersey Region, by Nelson Horatio 
Darton. 1890. g®. 82 pp. Price 10 cents. 
68. Earthquakes in California in 1860, by James Kdward Keeler. 1890. 8®. 25 pp. Prkm 5 cents. 
69. A Classed ami Annotated Bibliography of Foswil Insects, by Samuel Hubbard vSeudder. 1890. 
8®. 101 pp. Price 15 cents. 
70. Report on Astronomical Work of 1889 and 1890. by Robert Simpson Woodward. 1890. 8®, 70 
pp. Price 10 cents. 
In press; 
65. Comparative Stratigraphy of the Bitnminous Coal Rocks of tlie Northern Half of the Appala- 
chian Field, by I. C. White. 
7L Index to the Known Fossil Insects of the World, hy Samuel Hubbarti Scudder. 
72. Altitudes between Lake Superior and the Rocky Mountains, by Warren Upbam. 
73. The Viscosity of Solids, by Carl Barus. 
74. The Minerals of North Cnrolhin, by F. A. Genib. 
7.5. A Rc.coni of North American (Geology for 1887 to 1880. inclusive, by Kelson Horatio Darton. 
70. A Dictionary of Altitudes in the L'nitcd States (second edition), compiled by Henry Gannett. 
In preparalion: 
Mesozoic Fossils in tb« Permian of Texas, by C. A. White. 
— A Late Volcanic Eruption in Notibeni California and its Peculiar Lava, by J. S. Uillor. 
— Tbo CumprPhsibilily of Liquids, by Carl Barns. 
— The Eruptive and Sedimentary Rocks on Pigeon Point, Minnesota, and their contact phenomena, 
by W. S. Bayley 
— A Bibliography of Paleobotany, by David White. 
