Yl CONTENTS. 



Page 



On the Mountain Barometer 3 13 



Vegetable Alkalies 314 



Dcebereiner's Eudiometer 3 16 



New Minerals 316 



Death of Mr. Bowdich, in Africa 317 



New Scientific Books 317 



New Patents 318 



Mr. Howard's Meteorological Journal 3 1 9 



NUMBER V.— MAY. 



Remarks on Solar Light and Heat. By Baden Powell, MA 321 



Astronomical Observations. By Col. Beaufoy, FRS. . .' 328 



On the Decomposition of the Metallic Sulphates by Hydrogen Gas. By 



M. Arfwedson 329 



Analysis of some Minerals. By M. Arfwedson 343 



On the Theory of Evaporation. By J. Herapath, Esq 349 



Chemical Examination of Analcime, Copper Pyrites, and Sulphuret of 



Bismuth. By M. Rose 353 



Memoir on some Geometrical Principles connected with the Trisection 



of an Arc. By John Walker, Esq. (With a Plate) '356 



On the Crystalline Forms of Artificial Salts. By H. J.Brooke, Esq. FRS. 



and FLS. (continued) 364 



Apparatus for producing Instantaneous Light. By the Rev. J. Gum- 

 ming, MA. FRS. and Professor of Chemistry in the University of 



Cambridge 36 ."> 



On Nuttallite, a new Mineral. By H. J. Brooke, Esq. FRS. &c 366 



Reply to Mr. Henslow. By Dr. Berger 367 



Analytical Account of De la Beche's Selection of Geological Memoirs. . . 371 



Proceedings of the Royal Society 383 



• Linnean Society 386 



Zoological Club 388 



■ Astronomical Society 389 



— Geological Society 89 1 



•— *» Medico-Botanical Society of London 391 



The Logan Stone in Cornwall overturned 392 



The Rate of a Chronometer 392 



Cheltenham Water 393 



Detonating Silver and Mercury , 394 



Absorption of Air by Mercury 394 



Connexion of Phosphorescence with Electricity 395 



Preparation of Oxide of Nickel 395 



Prussian Blue 396 



New Scientific Books 396 



New Patents 307 



Mr. Howard's Meteorological Journal 399 



