CONTENTS. 
ExtraB of Let. XX. From the Honourable and Rev. 
[)r. Spsr.cet Cotvper, Dean of Durhain, to hts 
Brother the Ri^ht Hon. Bari Cowper, 
F R S P* 
Let. XXI. To Dr. John Srevenfon, Thyfician at 
Edinburgh. Communicated by Dr. John Pringle, 
f. R. S. Scotland, ^^Loch Ncfs. p. 388. 
■Extrabi of Let. XXII. From Sir James Colquhoun, 
of Lufs, to Mr. Fletcher, Member of parliament, 
dated Rofedoe, Dec. 8,1755. Communicated by 
Dr. Pringle, F. R. S. At Loch Lommond. P.390. 
Let XXIII. Communicated by Richard Brocklesby, 
M.E.F.R.S. ' ^ P- 393 ; 
Ler. XXIV. An Account of an extraordinary Al- 
teration in the Baths of Toplitz in Bohemia, on 
the firft of November 1755, in a Letter from 
Father jofeph Steplin to Janies Short, M. A. 
F. R. S. T ranflated from the Latin. p. 35 ? 5 - 
ExfraB of U ttcr XXVI. From Mr. Dc Hondt, of the 
Hague, concerning the Agitation of the IVaters, 
No vein . 1 . 1 7 5 5. T ranflutedfrom the F rc nch, and 
' co''i>municated by T . Birch, D.Z). Seer. R. S. p* 39 ^* 
FxiraB of Let. XXVII. From Monf Allamond, Pro- 
feffor of Philo fophy at Leyden, and F. R. S. dated 
Decern. 9, 1755, Mr. Trembley, F.R.S. 
Tranfated from French. P* 3 S> 7 * 
LIX. An Account of the Earthquake, Novem. i, 
L*i 7 i 5 > the Lead Mines in Dzxby- 
fhirej in a Letter from the Rev. Mr. Bullock to 
Lewis Cruilus, T>.D. F. R.S. Letter I. p. 398. 
Let. II. An Account of the Earthquake at Lisbon, 
Nov. I, 1755, m Two Letters from Mr. Wol. 
tall, Surgeon, to j. Parlous, M. D. F. R. S. p.402. 
Letter III. P- 4-08 
Let. IV. 
