320 
Some Relations between Gravity Anomalies and 
the Geologic Formation in the United States: 
WILLIAM Bowie. (Introduced by A. H. 
Brooks.) 
A report of an investigation of topography and 
its isostatic compensation upon the intensity of 
gravity will soon appear as a Coast and Geodetic 
publication. This and a subsequent investigation, 
involving 124 gravity stations, show the gravity 
anomalies in the United States are very small as 
a tule and that there is no apparent relation be- 
tween the size and sign of the anomalies and the 
character of the topography. There is, however, a 
relation between the sign of the anomalies and the 
geologic formation. The stations in the older 
formations tend to have anomalies of the positive 
sign, indicating an excess of mass, and the sta- 
tions in the most recent formations tend to have 
anomalies with the negative sign. It is probable 
that the anomalies are caused by erroneous as- 
sumptions regarding the surface density of the 
material at a station, and to a departure of the 
erust of the earth near the station from a state 
of complete isostatic compensation. 
The paper was discussed by H. F. Reid and the 
author. 
The following papers were presented by title: 
Geological Reconnaissance in Northeastern Nic- 
aragua: OSCAR H. HERSHEY. 
The Geology of Steep Rock Lake: ANDREW C. 
LAWSON. 
The Mesozoic Stratigraphy of Alaska: 
MARTIN. 
Color Scheme for Crystal Models: Grorce H. 
CHADWICK. 
Occurrence of Petrolewm Associated with Faults 
and Dikes: FREDERICK G,. CLAPP. 
New Minerals from the Favas of Brazil: OLIVER 
C. FARRINGTON. 
Progress of Opinion as to the Origin of the Iron 
Ores of the Lake Superior Region: N. H. 
WINCHELL. 
Saponite, Thalite, Greenalite and Greenstone: N. 
H. WINCHELL. 
Pre-Wisconsin Channels in Southeastern South 
Dakota and Northeastern Nebraska: J. E. Topp. 
Geographic Cycle in an Arid Climate: Should tts 
Development be by Wind or Water? CHARLES R. 
KEYES. 
The Effect of Rapid Off-shore Deepening on Lake 
Shore Deposits: RuruS MATHER Bace, JR. 
List of Underground Temperatures in the United 
States: N. H. Darton. 
G. C. 
SCIENCE 
[N.S. Vou. XXXV. No. 895 
A Bibliography of the Mammoth Cave: Horacr 
C. Hovey and R. ELLSwoRTH CALL. 
The following officers were elected for 1912: 
President—Herman LeRoy Fairchild, Rochester, 
Ilo) Mo 
First Vice-president—Israel C. White, Morgan- 
town, W. Va. 
Second Vice-president—David White, Washing- 
ton, D. C. 
Secretary—Edmund Otis Hovey, New York, 
INGRYS 
Treasurer—William Bullock Clark, Baltimore, 
Md. 
Editor—J. Stanley-Brown, Cold Spring Harbor, 
INGE 
Librarian—H. P. Cushing, Cleveland, Ohio. 
Councilors (1912-14)—S. W. Beyer, Ames, 
Towa, and Arthur Keith, Washington, D. C. 
Fellows elected December 28, 1911: R. C. Allen, 
Robert Van Vleck Anderson, Manley Benson 
Baker, Edwin Bayer Branson, Durdon Montague 
Butler, Stephen Reid Capps, Jr., George Halcott 
Chadwick, Clarence Norman Fenner, James H. 
Gardner, Walter Granger, John Sharshall Grasty, 
William Otis Hotchkiss, Cyril Workman Knight, 
Adolph Knopf, Lawrence Morris Lambe, Elwood 
S. Moore, Daniel Webster Ohern, Sidney Paige, 
Joseph E. Pogue, William Frederick Prouty, 
Elmer S. Riggs, Jesse Perry Rowe, John Joseph 
Rutledge, Joseph Theophilus Singewald, Jr., Bur- 
nett Smith, Frank Springer, Clinton Raymond 
Stauffer, Lloyd William Stephenson and Mayville 
William Twitchell. 
Wednesday evening the Geological Society of 
America joined with other affiliated societies and 
the general American Association for the Advance- 
ment of Science in listening to the address of 
welcome by President Taft. Thursday afternoon 
was devoted to visiting the Geophysical Labora- 
tory of the Carnegie Institution, while the evening 
was occupied with the annual dinner of the society 
followed by much speech making under the 
leadership of Dr. J. M. Clarke, of Albany, N. Y. 
On Friday evening, the presidential address of 
Professor Dayis was followed by a smoker at 
the Cosmos Club tendered by the Geological So- 
ciety of Washington to the Geological Society of 
America, the Paleontological Society and the Asso- 
ciation of American Geographers. 
The next meeting of the society will be held at 
Yale University, New Haven, Conn., a year hence. 
EpMuND OTIs HoveEy, 
Secretary 
