IV ADVERTISEMENT. 



In press : 



54. A Report on the Therrao-Electrical Measurement of High Temperatures, by Carl Barns. 

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

 lS86-'87. 



.56. Fossil Woods and Lignites of the Potomac Formation, by F. H. Kuowlton. 



57. Notes on the Geology of Southwestern Kansas, by Robert Hay. 



58. On the Glac.al Boundary, by G. F. Wright. 



In preparation : 



— The Gabbros and Associated Rocks in Delaware, by F. D. Chester. 



— Mineralogy of the Pacific Coast, by W. H. Melville and Waldemar Liudgren. 



— The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, by George 

 H. Williams; with an iutroductiou by R. D. Irving. 



— Bihliography of the Paleozoic Crustacea, by A. W. Vogdes. 

 — -The Viscosity of Solids, by Carl Barns. 



— On a Group of Volcanic Rocks from the Te wan Mountains, New Mexico, and on the occurrence 

 of Primary Quartz in certain Basalts, by J. P. Iddings. 



— On the relations of the Traps of the Jura-Trias of New Jersey, by N. H. Darton. 



— Altitudes between Lake Superior and the Rocky Mountains, by Warren Upham. 



— Mesozoic Fossils in the Permian of Texas, by C. A. White. 



— Natural Gas Districts in Indiana, by Arthur John Phinney. 



— A Late Volcanic Eruption in Northern California and its peculiar lava, by J. S. Diller 



— A Geueral Account of the Fresh-Water Morasses of the Uuited States, with a description of 

 the Dismal Swamp District of Virginia, by N. S. Shaler. 



STATISTICAL PAPERS. 



Mineral Resources of the United States [1832], by Albert Williams, jr. 1883. 8°. xvii, 813 pp. 

 Price 50 cents. 



Mineral Resources of the United States, 1883 and 1884, by Albert William.s, jr. 1885. 8°. xiv, 

 1016 pp. Price 60 cents. 



Miueral Resources of the United States, 1885. Division of Mining Statistics and Technology. 

 1886. 8°. vii, 576 pp. Price 40 cents. 



Miueral Resources of the Uuited States, 1886, by David T. Day. 1887. 8°. viii, 813 pp. Price 

 50 cents. 



Mineral Resources of the United States, 1887, by David T. Day. 1888. 8°. vii, 832 pp. Price 

 50 ceuts. 



In preparation : 



Miueral, Resources of the Uuited States, 1888, by David T. Day. 



The money received from the sale of these publications is deposited in the Treasury, and the 

 Secretary of that Department declines to receive bank checks, drafts, or postage stamps; all remit- 

 tances, therefore, must be by postal note or mon'ey order, made payable to the Librarian of the 

 U. S. Geological Survey, or in ccrrency for the exact amount. Correspondence relating to the pub- 

 lications of the Survey should be addressed 



To THE Director of the 



United States Geological Sukvby, 



Washington, D. C. 

 Washington, D. C, September 1, 1889. 



