Association of American Gieologists and Naturalists. 347 
The amazing momentum imparted by the pulsating crust to the sea 
above it, and the huge magnitude of the surges into which this would 
be thrown, would contribute greatly to the dispersion of the erratic mat- 
ter. In this manner Pref. Rogers conceives we may explain, by a series 
of tremendous earthquakes proceeding from a high arctic latitude, the 
rush of mingled water, ice, and fragmentary rock, at the formation of 
the so called “ drift”? which now overspreads all the northern parts of 
North America and Europe. Upon this view of the origin of that in- 
teresting stratum, a competent cause is suggested for the almost untver- 
sal scratching and polishing of the floor upon which the drift reposes, 
since the enormous velocity that would be imparted by the vast sea- 
waves to successive portions of the angular rocky matter, would natu- 
rally give the blocks and fragments great cutting power. It seems un- 
necessary therefore to appeal to the stranding of icebergs, for the force 
which scored and grooved the surface of the strata throughout the north- 
ern latitudes. 
Dr. Jackson exhibited to the members several specimens of 
sulphuret of antimony, silver ore, blende, and the tin reduced 
from the ore, exhibited at the last meeting, all from the state of 
New Hampshire. 
The attention of the meeting was then called to several points 
of business from the standing committee. 
The following nominations for membership, were proposed and 
confirmed. Prof. Albert Hopkins, Schenectady, N. Y., Mr. W. 
J. Lettsom, British legation, Washington, D.C., Dr. Norwood, 
Madison, N. Y., Dr. A. Clapp, New Albany, Ind., Dr. Charles 
Pickering, Washington, D. C., Hon. Judge B. Tappan, Steuben- 
ville, Ohio, Mr. M. 'Tuomey, Petersburg, Va., Dr. J.T. Plummer, 
Richmond, Indiana, Erastus Smith, Esq., Hartford, Ct., Dr. Jef- 
fries Wyman, Boston, Rev. E. H. Newton, Cambridge, N. Y., 
Mr. Geo. Gibbs, Mr. Wolcott Gibbs, and Dr. J. R. Chilton, New 
York, Prof. D. Olmsted, New Haven, Ct., Dr. Wm. M. Carpen- 
ter, and Dr. J. L. Riddell, New Orleans, Mr. Root, Syracuse, 
N. Y., Dr. Charles Page and Hon. H. L. Ellsworth, Washing- 
ton, D.C., Lt. Ruggles and Col. H. Whiting, Detroit, Mich., 
Mr. J. G. Anthony, Cincinnati, Ohio, Dr. William Darlington, 
Westchester, Pa., Mr. R. Buchanan, Cincinnati, Ohio, Dr. J. P. 
Kirtland, Geo. H. Cooke, Dr. John Wright, Troy, N. Y. 
Resolved, 'That all papers read at the present session of this 
Association, be handed as far as practicable to the Secretary, be- 
fore the rising of the Association. 
