942 The American Naturalist. [October, 
the Several Hypotheses of the Cause of the Glacial Period, Thomas 
C. Chamberlin. On the Northward and Eastward Extension of Pre- 
pleistocene Gravels in the Basin of the Mississippi; On Certain 
-Extra Morainic Drift Phenomena of New Jersey, R. D. Salisbury. In- 
equality of Distribution of the Englacial Drift, Warren Upham. 
Defloration and Deformation of Alluvial Deposits in New England, 
\ Homer T. Fuller, The Elzolite Syenite of Beemerville, N. Y., J. F- 
Kemp. On the Separation and Study of the Heavy Accessories of 
Rocks, Orville A. Derby. Contributions to the Areal Geology of the 
Texas-New Mexico Region: (a) The Tertiary History of the Rio 
Grande Embayment ; (4) The Llano Estacado and Edwards Plateau ; 
(c) The Basin Formations of New Mexico, and Accompanying Volcanic 
Craters; (<) The Las Vegas Raton Plateau, R. T. Hill. The Missouri 
Coal Measures and the Conditions of their Deposition, Arthur Wins- 
low. The Well’s Creek Basin and Uplift in Stewart and Houston 
Counties, Tennessee ; The Pelvis of the Megalonyx, and the Lot of 
Undescribed Bones Among which It is Found, from Big Bone Cave, in 
Tennessee, James M. Safford. The Cienegas of Southern California ; 
A Description and Discussion of Their Geological Structure and Origin, 
E. W. Hilgard. Notes on the Crystalline Rocks of Central Texas, . 
with Maps, T. B. Comstock. Ona Deep Boring near Akron, Ohio, 
and Its Signiflcance, E. W. Claypole. The Natural Bridges of Florida 
and the Chattahoochee Embayment, Lawrence G. Johnson, On 
Some Peculiar Causes which are Influencing Topographical Changes 
and Geological Formations in the Channel Islands of California, 
Lorenzo G. Yates. 
The International Geological Congress.—This body met in 
the Columbian University, Washington, D. C., from August 26th to 
September 2d, inclusive. The officers of the meeting were: Honorary 
presidents, J. D. Dana, James Hall. President, J. S. Newberry. 
Vice presidents—United States, Joseph Le Conte, J. W. Powell, and 
Raphael Pumpelly; Canada, J. C. K. Laflamme and W. Macfarlan ; 
Mexico, A. del Castillo ; England, T. McK. Hughes; Scotland, H. M. 
Cadell; France, A. Gaudry and Charles Barrois; Belgium, E. 
Van den Broeck; Holland, G. A. F. Molengraaff; Norway, H. 
Reusch ; ‘Sweden, Gerard de Geer; Russia, Th. Tschernychew, 
F. Schmidt, and A. Pavlow; Denmark, Dr. Johnstrup; Germany, 
Dr. Von Zittel and H. Credner; Austria, Dr. E. Tietze; Hungary, 
Joseph Von Szabo; Spain, M. F. de Castro ; Portugal, Joaquin Filippe 
Nery Delgado ; Italy, Prof. G. Uzielli; Switzerland, H. Golliez ; 
F 


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