tl CONTENTS OF VOL. XXV. — THIRD SERIES. 



Mr. Gassiot on the successful repetition of an Experiment in 

 which Electrical Tension is produced without Metallic Con- 

 tact 283 



Mr. Gassiot's description of an extensive series of the Water 

 Battery; with an Account of some Experiments made in order 

 to test the relation of the Electrical and the Chemical Actions 

 which take place before and after completion of the Voltaic 



Circuit 285 



Proceedings of the Royal Astronomical Society 302 



Preparation of the Purple Powder of Cassius 315 



On the Oxides and some other Compounds of Gold, by M.Figuier 315 

 On the Preparation and Properties of certain Chlorates, by 



M. Alexander Waechter 317 



Double Sulphate of Protoxide and Sesquioxide of Iron, by 



Mons. J. A. Poumarede 319 



Meteorological Observations for August 1844 319 



Table 320 



NUMBER CLXVIL— NOVEMBER. 



Dr. .1, Stenhouse's Examination of a yellow substance from 

 India called Purree, from which the pigment called Indian 

 Yellow is manufactured 321 



The Rev. M. O'Brien on the Propagation of Waves in a Resisted 

 Fluid ; with a new Explanation of the Dispersion and Ab- 

 sorption of Light, and other Optical Phaenomena. . „ 326 



Mr. Joule on Specific Heat 334 



Demonstration of the proposition that every function F (/a, w) 

 which does not become infinite between the limiting values 

 — 1 and 1 of jM. and and 2 tt of a; may be expanded in a 

 series of Laplace's Coefficients 337 



Mr. T. Forster's Notice of the Meteors of the 9th and 10th 

 of August, 1844, as witnessed at Bruges 339 



Mr. R. Harkness on the Action of the Yellow Rays of Light on 

 Vegetation 339 



Mr, W. J. Henwood's Descriptive Notice of the Morro Velho 

 Mine, Province of Minas Geraes ; and on the Relations be- 

 tween the Structure of the Containing Rocks and the Di- 

 rections of the Shoots of Gold in the Brazilian Mines 341 



Dr. Joseph Reade on Electro -Rotatory Points, and the Pyro- 

 Electricity of Glass , 344 



Mr. P. Elias's Description of a Simple Method of Magnetizing 

 Steel Bars 348 



Mr. J. D. Stagg's Remarks relative to the Prevention of Explo- 

 sions in Collieries 350 



