CONTENTS. 
L. An Account of a Blow upon the Heart , and of its 
Effecls : By Mark Akenfide, M. D . F. R. S. and 
Phyjician to Her Majefty. p. 353 
LI. Ratio conficiendi Nitrnm in Pcdolia : Author e 
Wolf, M. D. communicated by Mr. Henry Baker, 
F. R. S. ' p. 356 
LII. An Ffay towards folding a Problem in the DoBrine 
of Chances. By the late Rev. Mr. Bayes, F. R. S. 
communicated by Mr. Price, in a Letter to John 
Canton, A. M. F. R. S. p. 370 
LIU. An Account of the Sea Pen, or Pennatula 
Phofphorea of Linnaeus ; likewife a Defcription of a 
new Species 0/ Sea Pen, found on the Coaft of South- 
Carolina, with Obfervations on Sea-Pens in general. 
In a Letter to the Honourable Coote Mole! worth, 
j Efq-, M. D. and F. R. S. frGm John Ellis, Efq y 
F. R. S. and Member of the Royal Academy at Upfal. 
P-419 
LIV. A Letter from Mr. B. Wilfon, F. R. S. and 
Member of the Royal Academy at Upfal, to Mr. 
iEpinus, ProfeJJor of Natural Philofoply in the Im- 
perial Academy of Sciences at St. Peterfburg, and 
Member of the Academies oj Berlin, Stockholm, and 
Erfurth. p. 436 
LV. A Difcourfe on the Parallax of the Sun. By the 
Rev. Thomas Hornfby, M. A. Savilian Profejjbr 
of A/lronomy in the Univerfity of Oxford, andF.R. S. 
p- 467 
LA I. A Difcourfe on the Locus for three and four 
Lines celebrated among the ancient Geometers , by H. 
Pemberton, M. D. F.R. S. Lond. et R.A. Berol. S. 
In a Letter to the Reverend Thomas Birch, D. D. 
Secretary to the Royal Society. p. 498 
PHIL O- 
