CONTENTS. 2IS 



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. Lirtn, U. S. Senator from Mis. 

 souri. Communicated by the Hon. Mr. Linn 136 



Hon. H. S. Legar^, 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; Genera, 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 of the National 

 Institution. Hopes that the Institution will cmitinue 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 spwcies 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 )iis 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 



