CONTENTS. 



No. Page. 



XXXVIII. Continuation of the Astronomical Observations, made 



at Lancaster, in Penn. by Mr. A. Ellicott. 232 



XXXIX. A Description of a cave on Crooked Creek, with remarks 

 and observations, on nitre and gun-powder ; by Samuel Brown, 



M. D. of Lexington, Kentucky. 233 



XL. An Essay on the Vermillion colour of the blood, and on the dif- 

 ferent colours of the metallic oxides, with an application of these 

 principles to the arts; by S. F. Conover M. D. 247 



XLI. Observations of the eclipse of the sun, June 16th 1806 — 

 made at Lancaster, by A. Ellicott, Esq. 255 



XLII. Observations of the same ; made at the forest near Nat- 

 chez ; by William Dunbar Esq. 260 



XLIII. Observations on the same eclipse, made at Kinderhook, in 

 the state of X. York; by J. J. de Ferrer and J. Garnett. 264 



XLIV. Observations on the same, made at Bowdoin College, in 

 the district of Maine; by a member af the society. 275 



XLV. On finding the longitude from the moon's meridian altitude; 

 by William Dunbar. 277 



XLVI. An account of the Freestone quarries on the Potomac and 

 Rappahannoc rivers ; by B. H. Latrobe. 283 



XL VII. Further observations on the eclipse of \bth June, 1806, 

 a determination of the longitude of Natchez and New-Orleans, 

 also, an investigation of the semi-diameters of the sun and moon; 

 by J. J. de Ferrer. 29S 



XLVIII. Observations on the same eclipse; made by Simeon de 

 Witt Esq. of Albany, State of New-York. 300 



XLIX. Description and use of a new and simple Nautical Chart, 

 for working the different problems in Navigation ; for which 

 the Extra Magellanic Premium was awarded; by John Gar- 

 nett Esq. of New -Brunswick, New-Jersey. 303 



L. Observations to serve for a mineralogical map of the State of 

 - Maryland ; by S. Godon. 3 If 



LI. Memoir on the meteoric stones which fell from the atmo- 

 sphere, in the state of Connecticut, on the 14th of December 



