CONTENTS. 
• • » 
Yin 
XXXIX. An Account of a Suppreffion of Urine cured by a 
PunBure made in the Bladder through the Anus ; being 
an ExtraB of a Letter from Dr. Robert Hamilton,, 
Fellow of the Royal College of Phyficians at Edinburgh, 
and Phyfician at King’s-Lynn, in Norfolk, to Sir John' 
Pringle, Bart. P. R. S. p. 578 
XL. Obfervations made during the late Frojl at North- 
hampton. By A. Fothergill, M. D. Communicated 
by William Henly, F. R. S. p. 587 
XLI. An Account of the Magnetical Machine contrived by 
the late Dr. Gowin Knight, F. R. S. and prefented to 
The Royal Society, by John Fothergill, M. D. F. R. S. 
P-591 
XL II. Demonjlrations of Two Theorems mentioned in 
Art. XXV. of the Philofophical Tranfadtions for the 
Tear 1775. In a Letter from Charles Hutton, Efq * 
F. R. S. to the Rev. Dr. Horlley, Sec. R. S. p. 600 
XLIII. Experiments made in order to af certain the Na- 
ture of fome mineral Subflances', and , in particular , to 
fee how far the Acids of Sea-Salt and of Vitriol contri- 
bute to mineralize Metallic a?id other Subfiances. By 
Peter Woulfe, F. R. S. p. 605 
p 11 1- 
