Po Ss 
(1785. Donors. 
Sept. 27. Mr. 7. Al de 
Magellan, 
Samuel Vaughan, Efq. 
Dec. 16. Mr. Cha. W. 
Peale, 
1786, Jan. 20. Mr. #2. 
Mar /hall, 
June. Dr. Ed. Waring, 
by Mr. S. Vaughan, 
fe “Err. OF'Ne S; 
PRESENTS. 
Count Brahl’s account of the go- 
ing of Mr. Emery’s new chro- 
nometer for the pocket, which 
{carce differs twofeconds from 
mean time in 24 hours. Price 
go guineas, in a filver cafe. 
An account of a new hydroftatic 
balance, by Mr. Nicholfon. 
Defcriptions of ufeful machines 
and models of the fociety (in 
London) for the encourage-~ 
ment of arts, manufactures 
and commerce, illuftrated with 
copper plate defigns, 2 vols. 
folio, laft edition. 
Memoirs of the American aca- 
demy of arts and {ciences, 
4° 1785. 
An elegant portrait of Doctor 
Franklin. 
His book, entitled, an alphabe- 
tical arrangement of the foreft 
trees, &c. of North-America. 
Meditationes algebraice. 
Mifcellanea analytica, de wqua~ 
tionibus algebraicis, et curva- 
rum. proprietatibus. 
Meditationes analytice. 
Proprietates algebraicum curva- 
rum.—All written by himfelf, 
¥ff The 
