Royal Society. 393 
Brigade-Major. Communicated by the Right Hon. Sir 
Joseph Banks, Bart. K.B. P.R.S.—26. Additional Obser- 
vations on the Effects of Magnesia in preventing an in- 
creased Formation ef Uric Acid; with Remarks on the 
Influence of Acids upon the Composition of the Urine. By 
William Thomas Brande, Esq. F.R.S. Prof. Chem. R. I. 
Communicated by the Society for improving Animal Che- 
mistry.—27. Additions to an Account of the Anatomy of 
the Squalus Maximus, contained in a former Paper; with 
Observations on the Structure of the Branchial Artery. By 
Sir Everard Home, Bart. F.R.S.—28. Some further Obser- 
vations on a new detonating Substance. In a Letter from 
Sir Humpbry Davy, LL.D. F RS. V.P.R.I. to the Right 
Hon. Sir Joseph Banks, Bart. K.B. P.R.S.—29. Experi- 
ments on the Production of Cold by the Evaporation of the 
Sulphuret of Carbon. By Alexander Marcet, M.D. F.R.S. 
one of the Physicians to Guy’s Hospital.—30. On asa ine 
Substance from Mount Vesuvius. By James Smithson, 
Esq. F.R.S.—31. Some Experiments and Observations on 
the Substances produced in different chemical Processes on 
Fluor Spar. By Sir Humpbry Davy, LL.D. F.RS. V.P. 
R.1.—32. Catalogue of North Polar Distances of Eighty- 
four principal fixed Stars, deduced from Observations made 
with the Mural Circle at the Royal Observatory. By Jobn 
Pond, Esq. Astronomer Royal, F.R.S.—33. Observations 
of the Summer Solstice, 1813, with the Mural Circle at the 
othe Observatory. By John Pond, Esq. Astronomer Royal, 
RS. 
—_—_—_—_— 
LXV. Proceedings of Learned Societies. 
ROYAL SOCIETY. 
os 
Thursdav, Nov. 4, Puts Society assembled after the 
long vacation ; and the Right Hon. President Sir Joseph 
Banks, having so far recovered from his late indisposition, 
was carried into the meeting-room and placed in his chair. 
Dr. Wollaston read a paper describing an instrument which 
he has invented, for exhibiting at one view an epitome of 
what he calls *¢ chemical equivalents.” The instrumeit is 
made of paper with a moveable graduated slide, like that of 
the sliding rule; andthe names with the elementary principles 
or component parts of al] the acids arranged in the order of 
their relations to each other, and to their respective bases, 
stating the relative quantity by weight and measure of their 
contents of oxygen, hydrogen, azote, base and water, in- 
cluding 
