244 [February, 1843. 



STATED MEETING, February 7, 1843. 

 Vice President Morton in the Chair. 



WRITTEN COMMUNICATIONS. 



A letter was read from J. G. H. Kinberg, of Lund, Swe- 

 den, dated October 25, 1842, proposing exchanges in Natural 

 History. 



A communication from the American Philosophical So- 

 ciety, acknowledging the receipt of the last No. of the Aca- 

 demy's Proceedings. 



A Circular from the Medical Department of the National 

 Institute at Washington, soliciting communications, and pro- 

 posing inquiries on certain medical subjects. 



And a letter from Prof. Locke, dated Medical College, 

 Cincinnati, Ohio, January 23, 1843, describing some extra- 

 ordinary and beautiful forms of Sulphate of Lime, or fibrous 

 Gypsum, found in the Mammoth Cave, Kentucky. 



For these, as being a peculiar variety of this mineral, he 

 suggests the new name of "Oulophyllites." 



Prof. Johnson read an extract from a letter from Prof. 

 F. W. Johnston, of Durham, England, announcing the cha- 

 racters of a new species of sugar resembling mannite in ap- 

 pearance, but in the crystalline state having the constitution 

 of grape sugar, viz.: Carbon 24, Hydrogen 28, and Oxygen 

 2S; but losing by heat seven atoms of water, becoming Car- 

 bon 24, Hydrogen 24, Oxygen 24. 



This sugar drops from certain species of Eucalyptus 

 which abound in Van Dieman's Land and in New Holland. 

 It is not so sweet as grape sugar, and is not likely, therefore, 

 to meet with any extensive economical application. Theo- 

 retically, however, it is very interesting. 



