IV ('oiifents. 
Correspouilence.—Jnmes Hall and the New York State Survey, John 
M. Clabkk, 55. — Notes on the Geology of Southwestern New 
Mexico, Clement L. Webster, 57. 
PersniKil (mil Scientific Notes. — Bryn Mawr College, 59. — American 
Association for the Advanceiiient of Science, 59. — Academy of 
Natural Sciences of Philadelphia, (50. — Geological Society of Wash- 
ington, Gl.-New York Academy of Sciences, 62. 
AUGUST NUMBER. 
Note on the Discovery of a Sessile Conularia. — Article II. 
R. Rl'edemann. [Plate II.] 65 
Preglacial Erosion Cycles in Northwestern Illinois. O. 
H. Hershey. [Illustrated.] 71 
Note on the Formation of Gold Ore. K. von Kraatz. 
[Translated by H.V.Winchell] 100 
Notes on the Quaternary Geologj^ of the Mattawa and Ot- 
tawa Valleys. F. B. Taylor 108 
The Origin of the Wind Gap. Fred. B. Wright. [Plate 
III.] . 120 
Editorial Comment. — Supposed Pre-Taconic Organisms, 123. 
Review of Recent Geological Literature. — Die Lamellibranchiaten des 
Rheinischen Devon, mit Ausschlussder Aviculiden, L. Beuschau- 
SEN, 124. 
Correspondence. — Note on a recent Review on Tabulate Corals, F. W. 
Sardeson, 131. — The Plains Permian, F. W. Cragin, 131. 
Personal and Scientific News. — Obituaries: Gabriel Augusta Daubree. 
132.— Joseph Prestwich, 133. 
SEPTEMBER NUMBER. 
The So-Called Socorro Tripoli. C. L. Herrick. [Plates 
IV and v.] 135 
Pabeontology and the Biogenetic Law. Karl von Zittel. 140 
I'lie Retreat of the Ice-Sheet in the Narragansett Bay 
Region. J. B. Woodwortii. [Plate VI.] 150 
Origin and Age of the Laurentian Lakes and of Niagara 
Falls. Warren Upham. [Illustrated.] 169 
The Black River Limestone at Lake Nipissing. N. H. 
Winchell 178 
Editorial Comment. — The Missing Link, 179. — The Law of Priority, 182. 
—Das Thierreich, 182. 
Review of Recent Geological Literature. — Bulletins of American Pal- 
eontology, G. D. Harris, 183. — The Fauna of the Magnesian Ser- 
ies, F. W. Sardeson, 184.— The Fauna of the Cambrian of Tejrovic 
and Skrej in Bohemia, J. F. Pompeck.t, 186. — Geological Survey 
of New Jersey, John C. Smock, 187. — Evidences of Glacial Action 
in Australia in Permo-Carboniferous Time, T. W. Edgeworth 
David, 188. — The Straining of the Earth under Secular Cooling, 
