CONTENTS. 
F. R. S. from Edward Delaval, Efq ; F. R. S. 
p. 22 7. 
XLII. A Letter from Thomas Lawrence, M. D. to 
William Heberden, M. D. and F. R. S. concern- 
ing the Effects of Lightning , in Effex-ftreet, on the 
i%th of June 1764. p. 235. 
XLII I. An Account of what appeared on Opening the 
Body of an ajthmatic PerJ 'on : By W. Watfon, 
M. D. F. R. S. p. 239. 
XLIV. A Letter to the Marquifs of Rockingham, 
with form Obfer various on the Effects of Lightening. 
p. 246. 
XLV. Solis Defedtus cbfervatus in Collegio Romano a 
Patribns Societatis Jefu die prima Aprilis Anno 
mdcclxiv. Lempore pojl median noble m. p.254. 
XL VI. The Defcription of a New Hygrometer , in- 
vented by James Fergufon, F. R. S. p. 259. 
XLVII. Experiments and Obfervations on the Com - 
prejfibility of Water and J’ome other Fluids , by John 
Canton, M. A. F. R. S. p. 261. 
XLVII I. Concife Rules for computing the Ejfeffs of Re- 
fraction and Parallax in varying the Apparent Di- 
jlance of the Moon from the Sun or Star ; aljG an 
eafy Rule of Approximation for computing the Di- 
jlance of the Moon from a Star, the Longitudes and 
Latitudes of both being given , with Demonftrations 
of the fame : By the Rev. Nevil Mafkelyne, A. M. 
Fellow of Trinity College, in the Univerfty of 
Cambridge, and F. R. S. p. 263. 
XLIX. Extract of a Letter from Mr. John Winthrop, 
Prcfejfor of Mathematicks in Cambridge, New 
England, to James Short, A. M. F. R. S. p. 277. 
L. Obfervarion 
