MADE BY MR. ELLICOTT. 235 



1th. Emersion of the 3d satellite of Jupiter observed at 

 S 1 ' 23' 15" mean time, very clear. 



By Mr. Delambre's tables, the longitude of Lancaster as 

 deduced from each of the foregoing observations on the eclip- 

 ses of Jupiter's satellites will stand as follows. 



1804. 



1805. 



No. XXXIX. 



A Description of a Cave on Crooked creek, with Remarks and Ob- 

 servations on Nitre and Gun-Powder, by Samuel Brown, M. D. 

 of Lexington, Kentucky. 



Read February ;th, j8o6. 



THERE are few works on Natural History or Chemistry 

 which do not contain some facts or opinions concerning the 

 formation and properties of nitre. To recapitulate these facts, 



