Contents. v 
Correspondence. 
Direction of prc-Glacial stream flow, Frank Carney; ITodular 
barite and selenite crystals of Montana, /. P. Rowe 198 
Personal and Scientific News 199 
APRIL NUMBER. 
Evidence of the agency of water in the distribution of Loess 
IN THE Missouri valley. G. Frederick Wright. [Plates VII 
and VIII.] 205 
The Loess at St. Joseph. Miss Luella A. Ozven. [Plates IX 
and X.J 223 
On THE Classification of Sedimentary Rocks. A. W. Grabau. 228 
The Bragdon formation in Northwestern California. 0. H. 
Hershey 248 
Review of Recent Geological Literature. 
Mineral tables for determination of minerals by their physical 
properties, A. S. Eakle, 257; New Physical Geography, Ralph 
S. Tarr, 257 ; Geographic Influences in American history, A. 
P. Brigham, 257 ; Gems and gem minerals, O. C. Farrington, 
258; An attempt to classify Palaeozoic batrachian footprints, 
G. F. Matthew, 259; Harriman Alaska expedition, Volume 
III : Glaciers and Glaciation, G. K. Gilbert 259 
Monthly Author's Catalogue of American Geological Liter- 
ature 260 
Correspondence. 
Dr. Karl A. von Zittel, Charles H. Sternberg, 263 ; Pleisto- 
cene Foraminifera from Panama. Jos. A. Cushman, 265 ; New 
York Academy of Sciences, E. O. Hovey 266 
Personal .\nd Scientific News 269 
MAY NUMBER. 
Hanging Valleys in the Finger Lake Region of Central New 
York. [Plates XI-XV.] R. S. Tarr 271 
The Typical Species and Generic Characters of Aviculipec- 
ten, McCoy, George H. Girty 291 
On the Genus Rhyncopora, King, with Notice of a New Spe- 
cies. D. K. Greger 297 
Laws of Formation of New Mexico Mountain Ranges. [Plates 
XVI-XVIL] C. L. Herrick 301 
Ancient Lake Beaches on the Islands in Georgian Bay. 
[Plates XVIII-XIX.] Frank M. Comstock 312 
Editorial Comment. 
Pelehths [Plates XX-XXII] 319 
Review of "Recent Geological Literature. 
On the Structure of Pteraspidge and Cephalaspidae. JJ'. Patten. 325 
