IV Contents. 
Editorial Comment.— The U. S. Geological Survey, 189. 
Monthly Authors'' Catalogue of American Geological Literature .,191. 
Correspondence. — Further note on Uintacrinus, Frank Springer, 194. 
Personal and Scientific News, \9b. 
OCTOBER NUMBER. 
Miiieralogical and Petrographic Study of the Gabbroid 
Rocks of Minnesota and more Particularly of the 
Plagioclasytes. II. [Plate XX.] Alexander N. 
WiNCHELL 197 
Notes on the Fauna of the Burlington Limestone at 
Louisiana, Mo. R. R. Rowley 245 
Review of Recent Geological Literature.— Glacial Erosion in the Valley 
of the Ticino, W. M. Davis, 252.— The Geography of the Region 
about Devil's Lake and the Dalles of the Wisconsin, with Notes on 
Surface Geology, R. D. Salisbury and W. W. Atwood, 252. 
Monthly Authors^ Catalogue of American Geological Literature, 253. 
Correspondence. — Remains of the Mammoth in Arizona. Wm. P. 
Blake, 257. — Dr. Angelo Heilprin and the Decrease of Water in 
Nicaragua, J. Crawford, 257. 
Personal and Scientific News, 259. 
NOVEMBER NUMBER. 
Mineralogical and Petrographic Study of the Gabbroid 
Rocks of Minnesota and more Particularly of the 
Plagioclasytes. III. Alexander N. Winchell. 261 
Pores in the Ventral Sac of Fistulate Crinoids. F. A. 
Bather 307 
Some Curious Matters Illustrative of Geological Phe- 
nomena. [Plates XXI and XXII.] B. K. Emerson. 312 
Certain Faunal Aspects of the Original Kinderhook. 
C. R. Ketes 315 
Review of Recent Geological Literature. — A Contribution to the Geol- 
ogy of the Northern Black Hills, John Duer Irving, 322.— The 
Moraines of Southwestern South Dakota, and their attendant De- 
posits, James E. Todd, 323. — Elements of Mineralogy, Crystal- 
lography and BlowpipeAnalysis, from a Practical Standpoint, A. J. 
Moses and C. L. Parsons, 323.^ — A Hand-book of Rocks for Use 
Without the Microscope, J. F. Kemp, 324. 
Monthly Authors'' Catalogue of American Geological Literature, 324. 
Personal and Scientific News, 327. 
