[ iv 3 
XVII. On Gouty and Urinary Concretions. By William Hyde 
Wollaston, M. D. F. R. S. p. 386 
XVIII. Experiments on carbonated hydrogenous Gas; with a 
View to determine whether Carbon be a simple or a compound 
Substance. By Mr. William Henry. Communicated by Mr. 
Thomas Henry, F. R. S. p. 401 
XIX. Observations and Experiments on the Colour of Blood. 
By William Charles Wells, M.D. F.R.S. p. 416 
XX. An Account of the Trigonometrical Survey , carried on 
in the Tears 1 795, and 1796, by Order of the Marquis 
Cornwallis, Master General of the Ordnance. By Colonel 
Edward Williams, Captain William Mudge, and Mr. Isaac 
Dalby. Communicated by the Duke of Richmond, F. R. S. 
p. 432 
Presents received by the Royal Society, from November 17 96 
to July 1797. p. 543 
Index . p. 547 
