ADVERTISEMENT. Vv 
In press: 
84. Correlation papers—Neocene, by W. H. Dall and G. D. Harris. 
85. Correlation papers—The Newark System, by I. C. Russell. 
86. Correlation papers—A]gonkian and Archean, by C. R. Van Hise. 
90. A report of work done in the Division of Chemistry and Physics, mainly during the fiscal 
year 1890~91. F. W. Clarke, chief chemist. 
92. The Compressibility of Liquids, by Car] Barus. 
93. Some Insects of special interest from Florissant, Colorado, by S. H. Scudder. 
94. The Mechanism of Solid Viscosity, by Carl Barus. 
95. Earthquakes in California during 1890-91, by E. S. Holden. 
96. The Voiume Thermodynamics of Liquids, by Carl Barus. 
97. The Mesozoic Echinodermata of the United States, by W. B. Clark. 
98. Flora of the Outlying Coal Basins of Southwestern Missouri, by David White. 
99. Record of North American Geology for 1891, by Nelson Horatio Darton. 
In preparation : 
— Correlation papers—Pleistocene, by T. C. Chamberhn. 
100. Bibliography and Index of the publications of the U. 8S. Geological Survey, 1879-1892, by 
P. C. Warman. . 
101. Insect fauna of the Rhode Island Coal-field, by Samuel Hubbard Scudder. 
— The Eruptive and Sedimentary Rocks on Pigeon Point, Minnesota, and their contact phe- 
nomena, by W. S. Bayley. 
— The Moraines of the Missouri Cotean and their attendant deposits, by James Edward Todd. 
— A Bibliography of Paleobotany, by David White. 
STATISTICAL PAPERS. 
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 Wuited 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 cents. 
Mineral Resources of the United States, 1888, by David T. Day. 1890. 8°. vii, 652 pp. Price 
50 cents. ; 
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 MONEY ORDER, made payable to the Librarian of the 
U. S. Geological Survey, or in CURRENCY for the exact amount. Correspondence relating to the pub- 
lications of the Survey should be addressed 
To THE DIRECTOR OF THE 
UNITED STATES GEOLOGICAL SURVEY, 
WASHINGTON, D. C. 
WASHINGTON, D. C., ‘April, 1892. 
