Contents. v. 
Williams 230 
Preliminary description of new Lower Silurian sponges. 
[Illustrated]. E. 0. Ulrich 233 
Recent observations on the glaciation of British Colum- 
bia and adjacent regions. Geo. M. Dawson 249 
Conglomerates in New England gneisses. C. H. Hitch- 
cock 253 
Conglomerates enclosed in gneissic terranes. [Supple- 
ment]. Alexander Winchell 256 
Editorial Comment. — The building of tlie British Isles 262 
Review of recent geological literature. — Brachiospongidfe : A memoir on 
a group of Silurian sponges, Beecher, 268. — On the Ophiolite of 
Tliurman, Warren Co., N. Y., Merrill, 268. — A deadly gas-spring 
in the Yellowstone National Park, Weed, 269. — Geological survey 
of Arkansas, second annual report, Bran.ver, 269. — Texas 
geological and mineralogical survey ; first report of progress, 
Dumble, 270.— Les modifications et les transformations des gran- 
ulites du Morbihan; par Charles Barrois, 271. 
Recent publications, 272. 
Correspondence. — Observations on three Kinderhook fossils, R. li. 
Rowley, 274. — Foliation and sedimentation, A. C. Lawson, 276. 
Personal and Scientific Nems, 278. 
MAY NUMBER. 
Uriah Pierson James. [Portrait.] 281 
A portion of the geologic story of the Colorado river 
of Texas. [Illustrated]. Robert T. Hill 287 
Carboniferous glaciation in the southern and eastern 
hemispheres, — with some notes on the Glossopteris 
flora. C.D.White 299 
Variation exhibited by a carbonic gasteropod. [Illus- 
trated]. Charles R. Keyes 330 
Editorial Comment. — Unconformity at the falls of the Montmoreilci, 333. 
Review of recent literature. — Examination of water for sanitary and 
technical purposes, Leff.man and Beam, 334. — Bommeloen og 
Karmoen med omgivelser geologisk beskrevne, af dr. Hans 
Reusch, 335. — Shall we teach geology? A. Winchell, 336. 
Recent publications , 337. 
Correspondence. — Two svstems confounded in the Huronian, Selwyn, 
339. 
Personal and Scientific News, 340. 
JUNE NUMBER. 
Quaternary deposits and quaternary or recent elevation 
pf regions and Mountains in Brazil, with deductions 
as to the origin of Loess from its observed condi- 
tions there. James E. Mills 345 
The story of the Mississippi-Missouri. E. W. Claypole 361 
On Lingulasma, a new Genus, and eight new species of 
Lingula and Trematis. [Illustrated]. E. 0. Ulrich. 377 
The Mesozoic rocks of southern Colorado and northern 
New Mexico. J. J. Stevenson 391 
