viii CONTENTS. 
Tear 176 7, taken at the Royal Ho /pit al near Ply- 
mouth : By William Farr, M. D. Tranfmitted to 
William Watfon, M. D. F. R. S. p. 136. 
XX. An Account of Inoculation in Arabia, in a Letter 
jrom Dr. Patrick RuiTell, Phyfician at Aleppo, to 
Alexander RuiTell, M. D. F. R. S. preceded by a 
Letter from Dr. Al. Rufiell, to the Earl of Morton, 
P. R. S. p. 140. 
XXI. Part of a Letter from Dr. Wolfe, at Warfaw, 
to Henry Baker, Efquire , F. R. S. Communicated 
by Mr. Baker. p. 1 5 1. 
XXII. Extradl of a Letter from Mr. Peter Wargentin, 
Secretary of the Royal Academy of Sciences at Stock- 
holm, and F. R. S. dated February 23, 1768, to 
the Reverend Nevil Mafkelyne, B. D. F. R. S . 
Aftronomer Royal. p. 152. 
XXIII. Introdu&ion to two Papers of Mr. John 
Smeaton, F. R. S. by the Reverend Nevil Malkelyne, 
B. D. F. R. S. Ajlronomer Royal. p. 154. 
XXIV. A DiJ'courfe concerning the Menfrual Parallax , 
arifing from the mutual Gravitation of the Earth and 
Moon ; its Influence on the Obfervations of the Sun 
and Planets ; with a Method of obferving it: By 
J. Smeaton, F. R. S. . p. 156. 
XXV. Defcription of a new Method of obferving the 
Heavenly Bodies out of the Meridian : By J. Smeaton, 
F. R. S. p. 170. 
XXVI. A Specimen of a new Method of comparing 
Curvilineal Areas j by which many fuch Areas may be 
compared , as have not yet appeared to be comparable 
by a?iy other Method : By John Landen, F. R. S. 
p. 174. 
XXVII. Exp$r 
