IV. 
Contents. 
The artesian well at City park, Davenport, Iowa. A. S. 
Tiffany.. 117 
Barrande and the Taconic system. Jules Marcou ... . 118 
Editorial Comment. —A new glacial theory, 138.—The Geological Soci¬ 
ety of America, 140. 
Review of recent literature, 146.—Useful minerals of the United States, 
Albert Williams Jr., 146.—The visual area of the trilobite 
Phacops rana, John M. Clarke, 146.—Geological survey of the 
state of New York, James Hall, 147.—The attachment of Platy- 
ceras to crinoids, C. It. Keyes, 148.—The American Anthropolo¬ 
gist, 149.—Relations of Homosteus and Coccosteus, Traquair, 
149. —Pressure as a factor in metamorphism, Harker, 150.—More 
fossils in the Lower Cambrian of North Wales, T. McK. Hughes, 
150. —Ueber die eruptive Natur gewisser Gneisse sowie des 
Granulits im sachsischen Mittelgebirge, E. Danzig, 151. 
Personal and Scientific News, 152. 
MARCH NUMBER. 
Conglomerates enclosed in gneissic terranes. Alexan¬ 
der Winchell. 153 
Natural science at the University of Minnesota. [Illus¬ 
trated.] N. H. Winchell. 165 
Foliation and sedimentation. Andrew C. Lawson. . . . 169 
The Newark system. Israel C. Russell. 178 
Mr. Forster on earthquakes. R. D. Salisbury. 182 
The original location of Gryphsea pitcheri. Jules 
Marcou. 188 
Editorial Comment. —Rejoinder to Dr. Lawson, 193.—Another old 
channel of the Niagara river, 195. 
Review of recent literature. —Recherches sur les Poissons Paleozoiques, 
Lohest, 196.—The iron ores of the Penokee-Gogebic series of 
Michigan and Wisconsin, Van Hise, 197.—The great lake basins 
of the St. Lawrence, Drummond, 198.—Northern Kansas: Its . 
topography, geology, climate and resources, Hay, 199.—Les 
min6raux des roches, Levy and Lacroix, 199. Discovery of the 
ventral structure of Taxocrinus and Haplocrinus, and consequent 
modification in the classification of the Crinoidea, Waciismuth 
and Springer, 200.—Crotalocrinus : Its structure and zoological 
position, Wachsmuth and Springer, 201.—Preliminary report of 
the Dakota School of Mines upon the geology and mineral 
resources and Mills of the Black Hills of Dakota, Carpenter and 
Hofman, 202. 
Recent publications , 204. 
Correspondence. —On glacial erosion, J. W. Spencer, 208.—Two sys¬ 
tems confounded in the Huronian, A. Winchell, 212.—Artesian 
well at Woodhaven, L. I., John Bryson, 214. 
Personal and Scientific News, 215. 
APRIL NUMBER. 
Memoir of Mr. G. W.Featherstonhaugh. [Portrait]. J. 
D. Featherstonhaugh. 217 
American petrographical microscopes. [Illustrated]. N. 
H. Winchell. 225 
On the relation of the Devonian faunas of Iowa. H. S. 
