V 
/o 
III 
CO]N^TE]N^TS. 
JULY NUMBER. 
A New Gigantic Placoderm from Ohio. [lllnstratod. ] E. 
W. Glaypole 1 
The Stratigraphic Position of the Ogishlie Conglomerate. 
Uly S. Grant T T 4 
Notes on the Stratigrapliy of a Portion of Central Appa- 
lachian Virginia. X. H. Darton 10 
On the Significance of the White Chiys of the Ohio Ke- 
gion. Frank Leverett IS 
The Relation of Secular Deca}' of Rocks to the Formation 
of Sediments. Ralph S Tarr 25 
Notes on Some Pseudomorphs from the Taconic Region. 
[Illustrated.] W. H. Hobbs " . . . \\ 
On Some Basic Eruptive Rocks in the Vicinity of Lewis- 
ton and Auburn, Androscoggin Co.. Maine. [Il- 
lustrated.] George P. Merrili l!t 
On the Occurrence of Typical Chsetetes in the Devonian 
Strata at the Falls of the Ohio, and likcAvise in the 
Analogous Beds of the Eifel, in Germany. [Illiis- • 
trated.] C. Ro.minoek oG 
Review of Recent GeoJogicul Litcnitmr. — Tertiary Plants froiii Bolivia. 
N. L. Brittox, 63. — Cuprocassiterite, a new ^Mineral. T. Mere, 
64. — Bohemian Ganiptf;. (i. F. Kuxz, 64. — Flleoiite-syenite of 
Litchfield, Maine, and Ilawes' Hornblende-syenite from Red 
Hill, New Ham])shire. \V. S. Bavlev, 64.— The System of Min- 
eralogy of James Dwiglit Dana. E. S. Dax.\,64.— The ^Nlanning- 
ton Oil Field and the History of its Development. I. (". AVhite, 
65. — Notes on the (TeoIogj'"of the Valley of the .Middle Rio 
Grande. E. T. Dumule, 65. — Revision and ^NFonograpli of the 
Genus Ch(mophyllum. Will H. Siierzer, 66. 
Personal (iitd Srienl{p'c Xeirx. — The Royal Society of ('anada: Aiuiiial 
Meeting, 66. 
AIKJUST NUMBER. 
An Ai)proximate Interglacial Chronometer. Pis. tv. v, 
and VI. N, H. Winciikli C!' 
Notes on Manganese in Canada. H. P. Brimeij 80 
Keokuk Group of the Mississippi Valley. Ciias. S. 
liE.\riir.ER 88 
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