286 PROCEEDINGS OF [1843. 



Slate, together with a specimen of pure tin extracted from the ores, 

 for the cabinet of the National Institute. 



Mr. Lewis read a description of the apparatus used in making 

 light in light-houses, from the earliest records to the present improved 

 lenses and reflectors, and exhibited many interesting experiments 

 with the Bude and Drummond lights. 



On motion of Col. Kearney, it was 



Resolved, That the thanks of the Institute be presented to Mr. 

 Lewis for the experiments in lights exhibited this evening, and the 

 description read by him ; and that he be requested to furnish a 

 copy. 



Mr. Greenouah, from the Department of Natural History, sub- 

 mitted two circulars. 



Stated Meeting, April 10, 1843. 



The Corresponding Secretary announced the following contribu- 

 tions and deposites : 



For the Cabinet. 



Box of Shells, fcc, from Buenos Ayres and the River of Plate. 

 From H. fy. Gilbert, Buenos Ayres. 



Specimens of Pickeringite, (a new Mineral;) four bottles of varie- 

 ties of Native Nitrate of Soda, from Tarapaca, in Peru. — From 

 John H. Blake, Boston. 



Antique Piece of Sculpture, from Mexico. — From George S. Cur- 

 son. 



Specimens (five in number) of Insects, preserved between plates of 

 Mica, one hundred years since, by one of the Knights of Malta. — 

 From IVm. B. Hodgson. 



Box, containing prepared specimen of Cancer digitatus, Pensacola 

 Harbor. — From Edward Coale. 



Molar Tooth of Megatherium, belonging to the suite of Fossils, from 

 Georgia, presented to the Institute by Dr. Screven. — From Dr. 

 Screven, Savannah. 



Box, containing a series of Coins of the Ottoman Empire, (one hun- 

 dred and ninety-three in number.) — From John P. Brown, First 

 Dragoman of the U. S. Legation, Constantinople. 



Ear of Corn grown in Georgetown, D. C. ; each grain covered with 

 a husk or covering. — From John Trunnell. 



Poition of a Pine Tree of singular appearance, from the District of 

 Columbia. — From John JJilbus. 



Natural Coke, from norih side of James River, twelve miles above 

 liichmond. — From Dr. Toners, Richmond, Virginia. 



Five Copper Coins. — From Dr. IVm. Wallace. 



Two Monkeys, {Simia,) living, from Africa. — From Major TurnbuU. 



