ADVERTISEMENT. 
50. Invertebrate Fossils from California, Oregon, Washington Territory, and Alaska, by C. A. 
White. 
51. On the Subaerial Decay of Rocks and the Origin of the Red Color of Certain Formations, by 
Israel C. Russell. 
52. Geology of the Island of Nantucket, by N. S. Shaler. 
Jn preparation: 
— Notes on the Geology of Southwestern Kansas, by Robert Hay. 
— On the Glacial Boundary, by G. F. Wright. 
— The Gabbros and Associated Rocks in Delaware, by F. D. Chester. 
— Fossil Woods and Lignites of the Potomac Formation, by F. H. Knowlton. 
— Mineralogy of the Pacific Coast, by W. H. Melville and Waldemar Lindgren. 
— Report of Work Done in the Division of Chemistry and Physics, mainly during the fiscal year 
1886-'87. 
— A Report on the Thermo-Electrical Measurement and High Temperatures, by Carl Barus. 
— The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, by George 
H. Williams; with an Introduction by R. D. Irving. 
— Bibliography of the Paleozoic Crustacea, by A. W. Vogdes. 
STATISTICAL PAPERS. 
A fourth series of publications, having special reference to the mineral resources of the United 
States, has been undertaken. 
Of that series the following have been published: 
Mineral Resources of the United States [1882], by Albert Williams, jr. 1883. 8°. xvii, 813 pp. Price 
50 cents. 
Mineral Resources of the United States, 1883 and 1884, by Albert Williams, jr. 1885. 8°. xiv, 1016 
pp. Price 60 cents. 
Mineral Resources of the United States, 1885. Division of Mining Statistics and Technology. 1886. 
8°. vii, 576 pp. Price 40 cents. 
Mineral Resources of the United 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°. Price — cents. 
In preparation: 
Mineral Resources of the United States, 1888, by David T. Day. 1889. 8°. 
The money received from the sale of these publications is deposited in the Treasury, and the Secre- 
tary of that Department declines to receive bank checks, drafts, or postage stamps. All remittances, 
therefore, must be by postal note or money order, made payable to the Librarian of the U. S. Geo- 
logical Survey, or in currency, for the exact amount; and all correspondence relating to the publica- 
tions of the Survey should be addressed 
To the Director of the 
United States Geological Survey, 
Washington, D. 0. 
Washington, D. C, November 1, 1888. 
