CONTENTS. 
2l» 
M. Dufresnoy, Chief Engineer and Director of the Royal School of Mines; 
Paris, September 18, 1841: Respecting a specimen of oxide of iron from 
Missouri, sent to him by the Hon. L. F. Linn, U. S. Senator from Mis. 
souri. Communicated by the Hon. Mr. Linn. 13G 
Hon. H. S. Legar6, Attorney General of the U. S.; Washington, December 18, 
1841 : Acknowledging receipt of notification, that he is ex-officio a Director 
of the National Institution, and promising his assistance....... 138 
James P. Espy: Explanation of his theory of storms, as given at the meeting 
of the National Institution, January 24, 1842. 140 
Henry J. Rogers ; Baltimore, January 10th, 1842 : Explaining his model of 
the land telegraph. 154 
Thomas G. Clemson ; Havana, January 15,1842: Accompanying minerals 
from Cuba. 156 
E. Cutbush, Professor; Geneva, New-York, January 20, 1842 : Acknowledg. 
ing receipt of notification of his being elected a member of the National In¬ 
stitution : Columbian Institute established by himself and Thomas Law, in 
1816. 156 
W. C. Zantzinger; Washington, February 7, 1842: Accompanying a work 
by Captain Wheelwright on steam navigation in the Pacific. 157 
Hon. J. R. Poinsett; Pedee, S. C., February 7, 1842: Acknowledging re¬ 
ceipt of notification of his having been reelected President o? the National 
Institution. Hopes that the Institution will continue to receive the protec¬ 
tion of the Government. 157 
Robert Greenhow : Reports on papers submitted to the Department of Astrono¬ 
my and Natural Philosophy, presented February 14, 1842. 162 
Francis Markoe, Jun.: Report on Exchanges, presented February 14,1842. 163 
Walter R. Johnson : On the practical determination of the heating power of 
fuel....... 165 
E. Foreman, M. D.; Baltimore, December 10th, 1842 : On the subject of ex¬ 
changes..,... 168 
T. A. Conrad : Observations on a portion of the Atlantic tertiary region, with 
a description of new species of organic remains.. 171 
R. Harlan, M. D.: Description of a new extinct species of Dolphin, from 
Maryland, discovered by F. Markoe, Jun., in Calvert County, Maryland_ 195 
S. Webber, M. D.: Sketch of the geological features of the valley of the Con¬ 
necticut, at Charlestown, N. H... 197 
Richard Rush; Sydenham, near Philadelphia, March 4, 1842: On the Smith- 
son bequest, and the objects to which it should be devoted... 201 
P. S. Du Ponceau ; Philadelphia, April, 1842 : On the Smithson bequest. Ap¬ 
proves plan proposed by the Hon. W. C. Preston, U. S. Senator from South 
Carolina, in his bill on the Smithson bequest, presented to the Senate 
April 11th, 1842... 204 
Circular of the Department of American History and Antiquities of the 
National Institution for the Promotion of Science........ 208 
