PHILOSOPHICAL 
TRANSACTIONS. 
The CONTENTS. 
Part I. VOL. XLIX. 
I. '^rejjionibus ’bonder urn in Machinis motis. 
Page I. 
II. An Inveftigation of a General Rule for the 
Refolution of Jfoperimetrical Problems oj all 
Orders. By Mr. Thomas Simpfon, F. R.S. p. 4. 
III. Part of a Letter from John Huxham, M. D. 
F.R.S. to W. Warlbn. F\ R.S. in relation to 
the EjfeAs of Lightning at Plymouth. p. 16. 
IV. A remarkable Cafe of a 7norb'id Eye : By Mr. 
Edward Spry, Sirgton, at Plymouth, in Devon- 
fliire. p. 18. 
V. A Supplement to the Account of a difempered 
Skin, publijhed in the ^i.\.th Number of the Phi- 
lofophical Tranfadions. By Mr. Henry Baker, 
F. R. S. p. 2 1 . 
VI. An ExtraEl of the Suh fiance of Three Letters 
from Il'aac Jamincau, Efq; his Majefty's Confid 
at Naples, to Sir Francis Hoskins Eylcs Stiles, 
Bart, and F. R, S. concerning the late Eruption 
Mount Vcl'uvius. p. 24. 
a 2 Extract 
