250 PROCEEDINGS OF [1842. 



From Capt. Harrison H. Cocke, U. S. Navy, City Point, Vir- 

 ginia, July 17, 1842: Has sent to the Curator two boxes, one of 

 eocene, the other of miocene fossils, &c.; also, specimen of the 

 ciate-tish-rock, from Minorca. 



From Charles A. Poulson, Jr., Philadelphia, July 18, 1842. 



From C. H. E:d\varrls to Mr. Webster, Va., July 18, 1842. 



From Geronimo Valdes, Governor General of Cuba, July 19, 

 1842. 



From Joshua Leavitt, Boston, July 20, 1842: Presenting a copy 

 of his memorial on wheat, just published by the U. S. Senate. 



From Benjamin Hale, D. D., President of Geneva College, July 

 28, 1842: Acknowledging niembershi|>, and ofiering tine specimens 

 of minerals, &ic. ; sending copy of his baccalaureate address, &c., 

 &;c. 



From Capt. Chas. W. Skinner, U. S. Navy, Staunton, Virginia, 

 July 30, 1842. 



From W. D. Porter, U. S, Navy, Washington, August 4, 1842: 

 Referring to his former letter, suggesting the establishment of cabi- 

 nets on board ships of war, and intimating that the Secretary of the 

 Navy might appropriate the proceeds of the "slush fund" to the 

 purposes of filling these cabinets. 



From Thomas Sinclair, (engraver,) Philadelphia, Aug. 4, 1842. 



The Corresponding Secretary laid before the members a letter 

 from the President of the United States, dated on the 21sl June, to 

 Mr. Poinsett, President of the National Institute, tendering to the 

 Institute the Portrait of M. Guizot, by Mr. Healey, and Mr. Poin- 

 sett's reply, dated 23d of the same. 



He stated, that the Secretaries of War and Navy had acted upon 

 the resolution passed by the Institute at the meeting in May last, re- 

 questing them to address circulars to the officers of their respective 

 services, and he submitted to the meeting copies of their circulars. 

 And, that a letter dated 5th of April, 1842, had been addressed 

 to Col. Joachin Acosta, Charge d'Affaires of New Grenada, near 

 this Government, thanking him for a box containing rich specimens 

 of gold, silver, and emerald, from the mines of New Grenada, 

 and inviting him to be present at the meetng of the Institute. 



Major J. D. Graham, of the Topographical Engineers, gave a 

 verbal description of a parobolic reflector, used as a guide point in 

 the survey of the Northeastern Boundary Line. 



Dimpnsions of parabolic reflector, made for Major J. D. Graham, in June, 

 1841, by Henry N. Hooper & Co., of Boston: 



Diameter of reflector, 16.00 inches. 



Diatance from vcrte.x to baso, - . . 3.75 •' 



" of focus from vortex, - , - . 2.2.5 •• 



Diameter of large burner, .... 1.25 " 



" email " - - - - .50 



