Learned Societies. 433 



of the largefl tree growing thereon, the number of ks annu- 

 lars, and the fpecies of the tree, may tend to give feme idea 

 of their antiquity. If the works (hould be found to be of 

 mafonr)' ; the length, breadth, and height of tlie walls ought 

 to be carefully meafured, the form and nature of the ftones 

 defcribed, and fpecimens of both the cement and ftones fent 

 to the committee. 



** The beft methods of obtaining information on the other 

 fubjefts will naturally fuggeft themfelves to you, and we rely 

 on a difpofition favourable to our wilhes. 



** The Committee confift of the following gentlemen, iJiz. 

 Thomas Jeff'erfon, Prefident of the American Philofophical 



Society, at Monticello in Virginia. 

 James IVtlkinfon, Commander of the Army, at Head Ouarv 



ters. 

 George Turner, of the Weftern Territory, near Cinainnati. 

 Dr. Cafpar IFiJIar, Vice-Pref. of the A. P.S.-v 

 Dr. Adam Seybert. Secretary of ditto. | ^ , , , 



C./KP..A,and Vm Ph.ladelphu, 



Jon. IVtUiams, ) 



*' Your communications may be addrefled to any one of 

 the Committee; but the articles you may think pioper to 

 furnifli, fhould be fent to this place. 



Jn behalf of the Committee, I am, refpeAfuUy, 

 Sir, your obedient fervant, 



J. Williams, Chairman." 



At the meeting of this Society, January 10, 1799, among 

 other donations and communications, the following were 

 announced as having been received : 



A communication from Mr. Andrew Ellicot, determining 

 the latitude and longitude of the town of Natchez — A letter 

 from Dr. Priedlcy ou the dccompofilion of water — Three 

 barrels, containing the bones of non-defcript animals, and 

 two meteorological journals kept at Detroit and on a voyage 

 to Michihniacanac on the Lakes, by Gen. Wilkinfon — A 

 fpccimcn of mica from New Hampflurc — Experiments and 



Vol. IV. Ff obferva. 



