14 dons. — 18 juin-4 nov. 1877. 
S. L. Penfield. — On the Chemical Composition of Triphylite, from Grafton, New 
Hampshire, 425. 
G. H. Darwin. — On the Influence of Geological Changes on the Earth’s Axis of 
Rotation, 444. 
B. Silliman. — On an association of Gold with Scheelite in Idaho, 451. 
— Id., t. XIY, n os 79-82; 1877. 
J. D. Dana.— Supplément to the Account of the Discoveries in Vermont Geology 
ofthe Rev. Aug. Wing, 36; — On the relations of the Geology of Vermont to that 
of Berkshire, 37, 132, 202, 257. 
0. C. Marsh.— Principal characters of Coryphodontidæ, 81; — Characters of 
the Odontornithes, with Notice of a new allied Genus, 85 ; — Notice of a new and 
gigantic Dinosaur, 87 ; — Notice of some new Vertebrate fossils, 249. 
J. Le Conte. — On Critical Periods in the History of the Earth and their Relation 
to Evolution; and on the Quaternary as such a Period, 99. 
Ch. Wachsmuth. — Notes on the internai and external structure of Paleozoic 
Crinoids, 115, 181. 
0. Allen. — Chemical constitution of Hatehettolite and Samarskite from Mitchell 
Co., North Carolina, 128. 
E. S. Dana. — On the occurence of Garnets with the Trap of New-Haven, Con¬ 
necticut, 215. 
J. L. Smith. — A Description of the Rochester, Warrenton, and Cynthiana Me- 
teoric Stones, wich fell respectively December 21st, 1876, January 3d, 1877, and 
January 23d, 1877, with some Remarks on the previous falls of Meteorites in the 
same région, 219. 
G. B. Grinnell. — Notice of a new genus of Annelids from the Lower Silurian, 
229. 
F. W. Clarke. — An Analysis of Sylvanite from Colorado, 286. 
O’Conor Sloane. — Notes on the Analysis of Bituminous Coal, 286. 
W. Pengellv. — History of Cavern Exploration in Devonshire, England, 299. 
Philadelphie. Academy of Natural Sciences of—. Journal ofthe —, 
2 e sér., t. VIII, n° 2; 1876. 
— American Philosophical Society held at — for promoting Useful 
Knowledge. Proceedings ofthe—, t. XV; 1876. 
— Id., t. XVI, n os 98 et 99; 1876-77. 
Leslev. — Oil Well Records, selected from the collections of M. J. F. Carll, 346. 
L. Lesquereux. — On the Progress of the North American Carboniferous Flora, in 
préparation for the 2d Geological Survey of Pennsylvania, 397. 
E. S. Nettleton et J. F. Carll. — On the First Systematic Collection and discussion 
of the Venango County Oil Wells of Western Pennsylvania, 429. 
G. A. Kônig. — On Astrophyllite, Arfvedsonite and Zircon from El Paso Co., Colo¬ 
rado, 509. 
Ch. A. Ashburner. — A measured section of the Palæozoic Rocks of Central Penn¬ 
sylvania, from the top of the Allegheny River Coal Sériés, down to the Trenton 
Limestone in the Lower, or Cambro-Silurian System, 519. 
E. D. Cope. — A continuation of Researches among the Batrachia of the Coal 
Measures of Ohio, 573; — On a Dinosaurian from the Trias of Utah, 579; — On a 
new Proboscidian, 584 ; — On the Brain of Coryphodon , 616. 
Ch. E. Hall. — Contribution to Palæontology, 621. 
