XX 



On the mutual Action of Sulphuric Acid and Alcohol, with Observa- 

 tions on the Composition and Properties of the resulting Compound. 

 By Mr. Henry Hennell page 271 



On a Method of expressing by Signs the Action of Machinery. By 

 Charles Babbage, Esq. F.R.S 273 



On the Parallax of the Fixed Stars. By J. F. W. Herschel, Esq. M. A. 

 Sec. R.S 274 



A Formula for expressing the Decrement of Human Life. By Thomas 

 Young, M.D. For. Sec. R.S 275 



Account of an Experiment on the Elasticity of Ice. By Benjamin 

 Bevan, Esq 276 



Results of the Application of Captain Kater's Floating Collimator to 

 the Astronomical Circle at the Observatory of Trinity College, Dub- 

 lin ; and Remarks relative to those Results. By the Rev. J. Brink- 

 ley, D.D. F.R.S. P.R.I.A 276 



On the Means of facilitating the Observation of distant Stations in 

 Geodsetical Operations. By Lieutenant Thomas Drummond 277 



On the Production and Formation of Pearls. By Sir Everard Home, 

 Bart. V.P.R.S 278 



On Burrowing and Boring Marine Animals. By Edward Osier, Esq. 278 



An Account of some Experiments relative to the Passage of radiant 

 Heat through glass Screens. By the Rev. Baden Powell, M.A. F.R.S. 280 



The Bakerian Lecture. On the Relations of Electrical and Chemical 

 Changes. By Sir Humphry Davy, Bart. P.R.S 281 



On the Discordances between the Sun's observed and computed Right 

 Ascensions, as determined at the Blackman -street Observatory, in 

 the Years 1821 and 1822; with Experiments to show that they did 

 not originate in instrumental Derangement. Also a Description of 

 the seven-feet Transit with which the Observations were procured, 

 and upon which the Experiments were made. By James South, 

 Esq. F.R.S 285 



On the Existence of a Limit to Vaporization. By M. Faraday, F.R.S. 286 



On Electrical and Magnetic Rotations. By Charles Babbage, Esq. 

 F.R.S. &c. &c 287 



Case of a Lady born blind, who received Sight at an advanced Age 

 by the Formation of an artificial Pupil. By James Wardrop, Esq. 

 F.R.S.E .......;. 289 



On the progressive Compression of Water by high Degrees of Force, 

 with some Trials of its Effects on other Fluids. By J. Perkins .... 289 



On the Figure of the Earth. By George Biddell Airy, M.A 290 



Account of Experiments made with an Invariable Pendulum at the 

 Royal Observatory at Greenwich, and at Port Bowen, on the east- 

 ern side of Prince Regent's Inlet. By Lieutenant Henry Foster, 

 R.N. F.R.S .. 290 



Observations on the diurnal Variation of the Magnetic Needle, at the 

 Whale Fish Islands, Davis's Strait. By Lieutenant Henry Foster, 

 R.N. F.R.S. , 293 



