IV CONTENTS. 



Page 

 Dr. Ure's Experiments to determine the Fluency or Viscidity of different 

 Liquids at the same Temperature, and of the same Liquids at different 



Temperatures 22 



Mr. W. J. Frodsham's Notice of a comparative Pendulum .... 24 

 Mr. J. K. Smythies on the Motion of Points or Atoms subject to any 



law of force 24 



Rev. William Hopkins on certain Results, regarding the minimum 

 thickness of the Crust of the Globe, which might be consistent with 

 the observed phsenomena of Precession and Nutation, assuming the 



earth to have been originally fluid 26 



Rev. Charles Blackburn's Notice of certain Analytic Theorems . . 26 

 The Rev. Wm. Whe well's Remarks on Dr. Wollaston's argument re- 

 specting the infinite Divisibility of Matter, drawn from the finite Ex- 

 tent of the Atmosphere 26 



Mr. E. J. Dent's Account of a recent successful Experiment to deter- 

 mine, by means of Chronometers, the difference of Longitude between 



Greenwich and New York 27 



Mr. E, J. Dent's Note accompanying a Table of the Rate of the Transit- 

 Clock in the Radclyff Observatory, Oxford 28 



Mr. Parsey on Natural Perspective 29 



Lieut. Morrison on an analogy between the atomic weights of certain 

 Gases and the expansions of the primitive colours of the Solar Spectrum 29 



CHEMISTRY. 



Professor Graham on the Theory of the Voltaic Circle 29 



Professor Schonbein's Notice of new Electro-chemical Researches . . 31 

 Professor Reich's Researches on the Electrical Currents on Metalliferous 



Veins made in the mine Himmelsfurst, near Freyberg 34 



Dr. Hare's Observations on the preparations of Barium and Strontium 36 

 Rev. W. R. Grove on a small Voltaic Battery of extraordinary energy . 36 

 Mr. Thomas Spencer's Notices of Experiments on the deposition of 



Metals by Voltaic Action 38 



Dr. Samuel Brown on the Artificial Crystallization of certain Metallic 



Carburets, as extensive of the Theory of Crystallization 39 



Dr. George Wilson's Experimental Demonstration of the certain ex- 

 istence of Haloid Salts in Solution 41 



Dr. Thomas Clark on the limits within which the Atomic Weights of 



Elementary Bodies have been ascertained 43 



Dr. Charles Schaphaeutl on the relative Combinations of the Consti- 

 tuents of Cast Iron, Steel, and Malleable Iron 49 



