AG 
CO NTEN TS. 
JULY* NUMBER. 
Benjamin Franklin Shumard. [Portrait.] 1 
Studies in the Indiana natural gas field. Fkank Lev- 
ERETT 6 
On Lingulasma, a new genus, and eight new species of 
Lingula and Trematis. [Continued]. E. 0. Ulrich. 21 
The age of the Tipton run coal of Blair county, Penn- 
sylvania. I. C. White 25 
Meteorites and what they teach us. [I.] H. Hensoldt. 28 
The general interior condition of the earth. [Illus- 
trated]. Joseph LeConte 38 
The late session of the international congress of geol- 
ogists at London. Persifor Frazer 44 
Review of recent geological literature. — The ropk scorings of the great ice- 
invasions, T. C. Chamberlin, 57. — Die Stamme des Thierreichs, 
Neltmayr, 58. — The Archean geology of the region northwest of 
lake Superior. A C. Lawson, 59. 
Correspondence.— The Taconic in the Salt Range of Punjab (India). 
Jules Marcou, 60. 
Personal and Scientific News, 63. 
AUGUST NUMBER. 
David Dale Owen, M. D. [Portrait] 65 
Meteorites and what they teach us. [II]. H. Hensoldt, 
Ph. D 73 
Notes on the ore deposit of the Treadwell mine, Alaska. 
George M. Dawson 84 
On the microscopic character of the ore of the Tread- 
well mine, Alaska. [Illustrated.] Frank. D. Adams. 88 
New characters of Diphyphyllum simcoense (Bill.) 
Rom. [Illustrated.] Will H. Sherzer 93 
Iron Butte, Montana — Some preliminary notes. S. Cal- 
vin 95 
On certain camptonite dikes near Whitehall, N. Y. 
[Illusirated.J J. F. Kemp and V. F. Marsters].. . 97 
Notice of some new and remarkable forms of crinoidea 
from the Niagara limestone at St. Paul, Indiana. 
Charles S. Beachler. . . .• 102 
Review of recent geological literature. — Obsidian cliff in Yellowstone 
National Park, Joseph P. Iddings, 103. — Report on the geology 
of Martha's Vineyard, Nathaniel S. Shaler, 104. The ice age 
in North America, G. Frederick Wright, 106. — Bulletin of the 
American Museum of Natural History, Vol. ii. No. 2; geological 
papers, by R. P. Whitfield, 108. — Discovery of Cretaceous mam- 
mals, by Prof O. C. Marsh, 108. — Invertebrate fauna of the 
Hawkesbury-Wianamatta series of New South Wales, Robert 
Etheridge. Jr., 109. — Contributions to the Tertiary flora of Aus- 
tralia, Baron von Ettingshausen, 110. — Record of the geological 
survey of New South Wales, Vol. i, parti. III. — Classification of 
Cambrian and Pre-Cambrian, R. D. Irving, III.— The structure 
