XI 



An Account of a New Mode of performing the High Operation for the 

 Stone. By Sir Everard Home, Bart. V.P.R.S page 131 



A Sketch of an Analysis and Notation applicable to the Estimation of 

 the Value of Life Contingencies. By Benjamin Gompertz, Esq. F.R.S. 132 



On the Measurement of Snowdon, by the Thermometrical Barometer. 

 By the Rev. F. J. H. Wollaston, B.D. F.R.S 132 



On Sounds Inaudible by certain Ears. By William Hyde Wollaston, 

 M.D. P.R.S 133 



Particulars respecting the Anatomy of the Dugong, intended as a 

 Supplement to Sir T. S. Raffles's Account of that Animal. By Sir 

 Everard Home, Bart. F.R.S 134 



On the Compressibility of Water. By Jacob Perkins, Esq 134 



Astronomical Observations. By Stephen Groombridge, Esq. F.R.S. 135 



1821. 



On the Black Rete Mucosum of the Negro being a Defence against 

 the Scorching Effect of the Sun's Rays. By Sir Everard Home, 

 Bart. F.R.S page 135 



On the Magnetic Phenomena produced by Electricity. In a Letter 

 from Sir Humphry Davy, Bart. F.R.S. to W. H. Wollaston, M.D. 

 P.R.S 136 



A Communication of a singular Fact in Natural History. By the 

 Right Honourable the Earl of Morton, F.R.S 137 



Particulars of a Fact, nearly similar to that related by Lord Morton, 

 communicated to the President, in a Letter from Daniel Giles, Esq. 137 



The Croonian Lecture. Microscopical Observations on the following 

 Subjects. On the Brain and Nerves; showing that the Materials 

 of which they are composed exist in the Blood. On the Discovery 

 of Valves in the Branches of the Vas breve, lying between the Vil- 

 lous and Muscular Coats of the Stomach. On the Structure of the 

 Spleen. By Sir Everard Home, Bart. V.P.R.S 137 



On Two New Compounds of Chlorine and Carbon, and on a New 

 Compound of Iodine, Carbon, and Hydrogen. By Mr. Faraday . . 138 



An Account of the Comparison of various British Standards of Linear 

 Measure. By Captain Henry Kater, F.R.S , 139 



An Account of the Urinary Organs and Urine of Two Species of the 

 genus Rana. By John Davy, M.D. F.R.S 140 



An Account of a Micrometer made of Rock Crystal. By G. Dollond, 

 F.R.S 141 



The Bakerian Lecture. On the best kind of Steel and Form for a 

 Compass Needle. By Captain Henry Kater, F.R.S 141 



Notice respecting a Volcanic Appearance in the Moon. By Captain 

 Henry Kater, F.R.S 142 



A Further Account of Fossil Bones discovered in Caverns inclosed in 

 the Lime-stone Rocks at Plymouth. By Joseph Whidbey, Esq. ... 142 



On the Aeriform Compounds of Charcoal and Hydrogen ; with an Ac- 

 count of some Additional Experiments on the Gases from Oil and 

 from Coal. By William Henry, M.D. F.R.S 143 



