XXHl 



On the Corrections in the Elements of Delambre's Solar Tables re- 

 quired by the Observations made at the Royal Observatory, Green- 

 wich. By George Biddell Airy, Esq. M.A page 328 



Experiments to determine the Difference in the Length of the Seconds 

 Pendulum in London and in Paris. By Captain Edward Sabine, 

 Sec. R.S 329 



On the Measurement of High Temperatures. By James Prinsep, Esq. 331 



On Captain Parry's and Lieutenant Foster's Experiments on the Ve- 

 locity of Sound. By Dr. Gerard Moll 332 



An Account of a Series of Experiments made with a view to the Con- 

 struction of an achromatic Telescope with a fluid concave Lens, in- 

 stead of the usual Lens of Flint Glass. By Peter Barlow, Esq. 

 F.R.S. &c 333 



A Catalogue of Nebulae and clusters of Stars in the Southern Hemi- 

 sphere, observed at Paramatta in New South Wales. By James 

 Dunlop, Esq 334 



An Account of Trigonometrical Operations in the Years 1821, 1822, 

 and 1823, for determining the Difference of Longitude between the 

 Royal Observatories of Paris and Greenwich. By Captain Henry 

 Kater, V.P.R.S 335 



On the Phenomena of Volcanoes. By Sir Humphry Davy, Bart. F.R.S. 338 



Abstract of a Meteorological Journal kept at Benares during the Years 

 1824, 1825, and 1826. By James Prinsep, Esq 340 



A Description of a vertical floating Collimator; and an Account of its 

 application to Astronomical Observations with a Circle and with a 

 zenith Telescope. By Captain Henry Kater, V.P.R.S 340 



On the Height of the Aurora Borealis above the surface of the Earth ; 

 particularly one seen on the 29th of March, 1826. By John Dai- 

 ton, F.R.S 342 



A Comparison of the Changes of Magnetic Intensity throughout the 

 Day in the Dipping and Horizontal Needles, at Treurenburgh Bay 

 in Spitsbergen. By Captain Henry Foster, R.N. F.R.S 344 



Experiments relative to the Effect of Temperature on the refractive 

 Index and dispersive Power of Expansible Fluids, and on the In- 

 fluence of these Changes in a Telescope with a fluid Lens. By Peter 

 Barlow, Esq. F.R.S. &c. 345 



On some Circumstances relating to the Economy of Bees. By Thomas 

 Andrew Knight, Esq. F.R.S 346 



On the Laws of the Deviation of Magnetized Needles towards Iron. 



By Samuel Hunter Christie, Esq. M.A. F.R.S. &c 347 



Description of a Sounding Board in Attercliffe Church, invented by 



the Rev. John Blackburn 349 



On the mutual Action of Sulphuric Acid and Alcohol, and on the Na- 

 ture of the Process by which Ether is formed. By Henry Hennell, 

 Esq 350 



Experiments and Observations on Electric Conduction. By William 

 Ritchie, A.M. F.R.S 350 



On Magnetic Influence in the Solar Rays. By Samuel Hunter Christie, 

 Esq. M.A. F.R.S. &c 351 



