IV. Contents. 
The artesian well at City park, Davenport, Iowa. A. S. 
Tiffany 117 
Barrancle and the Taconic system. Jules Marcou 118 
Editorial Comment.— A new glacial theory, 138.— The Geological Soci- 
ety of America, 140. 
Jieview of recent literature, 146.— Useful minerals of the United States, 
Albert Williams Jr., 14(5.— The visual area of the trilobite 
Phacops rana, John M. Clarke, 146.-- -Geological survev of the 
state of New York, James Hall, 147.— The attachment oif Platy- 
p^^i ceras to crinoids, C. R. Keyes, 148.— The American Anthropolo- 
gist, 149. — Relations of Homosteus and Coccosteus, Traquair, 
149. — Pressure as a factor in metamorphism. Barker, 150. — More 
fossils in the Lower Cambrian of North Wales, T. McK. Hughes, 
150. — Ueber die eruptive Natur gewisser Gneisse sowie des 
Granulits im siichsischen Mittelgebirge, E. Danzig, 151. 
.Pergonal and Scientific News, 152. 
MARCH NUMBER. 
|.€onglomerates enclosed in gneissic terranes. Alexan- 
der WiNCHELL. 153 
|l^atural science at the University of Minnesota. [Illiis- 
;' 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 Comvieut.—Jloioinder 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 
mineraux des roches, Levy and Lacroix, 199. Discovery of the 
ventral structure of Taxocrinus and Haplocrinus, and consequent 
modification in the classification of the Crinoidea, Wachsmutii 
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 puhJi cations, 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 Netvs, 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. 
