The CONTENTS. 
i 
tard, to the Rev. Thomas Shaw, 2 ). 2 ). 
F. R. S. and Principal of St. Edmund- 
Hall, concerning the Chinefe Chronology 
and Aftronomy. 476. 
XIV. Part of a Letter from Mr. Tur- 
berville Needham to James Parfons M. D. 
F.R.S. of a new Mirror, which burns at 66 
Feet Difiance , invented by M. de Buffon 
F.R.S. and Member of the Royal Academy 
of Sciences at Paris. 493. 
XV. ExtraEl of a Letter from the Marquis 
Nicolini F. R. S. to the Prefident, concern- 
ing the fame Mirror burning at 150 Feet 
Difiance. 495. 
XVI. Epifola Jo. Henrici Winkleri, Prof. 
Lipf. & R. S. Lond. S. ad Societatem Re- 
galem Londinenfem data , quce continet 
Defcviptionem & Figuras Pyrorgani fui 
Electrici. 497 * 
XVII. Some Obfervations upon Gems or Pre- 
cious Stones ; more particularly fuch as the 
Ancients ufed to engrave upon , by Robert 
Dingley, Efq\.^ 502. 
XVIII. Quadrantis Aftronomici Muralis Idea 
nova et peculiar is, multi s incotnmodis qui- 
bus hucufque uftati laborant liber ati, Au- 
tore Chr. Ludovic. Gerften, R.S.L.S. 507. 
XIX. Obfervationes duce Alberti Haller, Prof. 
Med. 
