Contents 
THE NEBULAR AND PLANETESIMAL THEORIES OF THE 
EARTH'S ORIGIN. Warren Upham 202 
DR. NANSEN'S "BATYHMETRICAL FEATURES OF THE 
NORTH POLAR SEA, WITH A DISCUSSION OF THE 
CONTINENTAL SHELVES AND THE PREVIOUS OSCIL- 
LATIONS OF THE SHORE LINE." J.W.Spencer 321 
PROF. SHIMEK'S CRITICISM OF THE AQUEOUS ORIGIN 
OF LOESS. Gi Frederick Wright 236 
CHEMISTRY OF CALIFORNIA PETROLEUM. Paul W. 
Prutzman 240 
ON THE TOOTH-STRUCTURE OF MESOHIPPUS WESTONI 
(COPE). Lawrence M. Lambe. [Plate XIVJ 243 
EDITORIAL COMMENT. 
Summer Courses in Field Geology 245 
With Regard to Portage Crinoids 246 
REVIEW OF RECENT GEOLOGICAL LITERATURE. 
A Reconnaissance in Northern Alaska, across the Rock 
Mountains along Koyukuk. John, Anaktuvuk and Colville 
Rivers and the Arctic coast to Cape Lisburne in 1901. 
Frank Charles Schrader, 247; On the Origin of the Marine 
(Halolinmic) Fauna of Lake Tanganyika. W. H. Hudle- 
ston, 249; Geology of the Vicinity of Little Falls, Herkimer 
County, N. Y., H. P. Gushing, 250; Bohemia, Dr. J. J. Jahn. . 250 
MONTHLY AUTHOR'S CATALOGUE 251 
CORRESPONDENCE. 
Prof. James Hall and the Troost Manuscript. J. M. Clarke 256 
PERSONAL AND SCIENTIFIC NEWS 257 
MAY NUMBER. 
BENJAMIN WEST FRAZIER. Persifor Frazer. [Portrait.] 
Plate XV 263 
DEEP WELLS AS A SOURCE OF WATER SUPPLY, FOR 
MINNEAPOLIS. N. H. Winchell. [Plates XVI-XIX.] 266 
EVIDENCE ON THE DEPOSITION OF LOESS. Luella A. 
Owen. [Plate XX.] 291 
MISSOURI PALEONTOLOGY. R. R. Rowley. [Plate XXL] . . 301 
FJORDS AND HANGING VALLEYS. Warren Upham 312 
REVIEW OF RECENT GEOLOGICAL LITERATURE. 
Glaciation of the Green mountains, C. H. Hitchcock, 316; 
Groseilliers and Radisson, the first white men in Minne- 
sota, 1655-56 and 1659-60, and their discovery of the upper 
Mississippi river. Warren Upham. 317; Preliminary report 
on the Geology and underground water resources of the cen- 
tral great plains. N. H. Darton, 317 
MONTHLY AUTHOR'S CATALOGUE OF AMERICAN GEOLO- 
GICAL LITERATURE 318 
CORRESPONDENCE. 
A Correction. J. F. Whiteaves 324 
