CONTENTS. 
i. 1752. concerning fome vegetable Balls; with 
Remarks on them by Mr. Wm. Watfon. p. 4,98. 
LXXXIV. A Letter from the Rev. William Henry, 
D. D. to the Right Honourable the Lord Cado- 
gan, F. R. S. concerning the Copper Springs in 
the County of Wicklow in Ireland, p. foo. 
LXXXV. ExtraCl of a Letter to Dr. Maty, F. R. S. 
from Geneva, concerning the Introduction and 
Succefs of Inoculation in that City , p. 5-03. 
LXXXVI. A Letter from James Parfons, M. D. 
F. R. S. to the Rev. Mr. Birch, Seer. R. S. con- 
cerning the Formation of Corals, Corallines, &c. 
p. yoy. 
LXXXVII. A further Account of the late Plague 
at Conftantinople, in a Letter of Dr. Mackenzie 
from thence , of the 23 of April iyjz. to John 
Clephane, M. D. F.R.S- p. f 14. 
LXXXVIII. A Letter of Mr. James Short, F.R.S. 
to the Royal Society, concerning the Inventor of 
the Contrivance in the ‘Pendulum of a Clock , to 
prevent the Irregularities of its Motion by Heat 
and Cold , p. 517. 
LXXXIX. A Letter from Mr. Henry Eelcs, to the 
Royal Society, concerning the Caufe of Thunder, 
p. 524. 
XC. ExtraCl of Two Letters of Thomas Hope, 
M 1 D. to John Clephane, M. D. F. R. S. con- 
cerning Monfieur Daviel'j Method of couching a 
Catarad, p. 530. 
XCI. Letters of the Abbe Mazeas, F. R. S. to the 
Rev. Stephen Hales, D. D. F. R . S. concerning 
the Succefs of the late Experiments in France. 
Tranflated from the French by James Parfons, 
M. D. F. R. S. p. 534. 
XCII. 
