Vi CONTENTS. 



Page 



Mr. R. Hunt's Experiments and Observations on Light which 

 has permeated coloured Media, and on the Chemical Action 



of the Solar Spectrum , 267 



Mr. Weaver on the Mineral Structure of the South of Ireland, 

 with correlative matter on Devon and Cornwall, Belgium, 



the Eifel, &c 276 



Dr. C. Schafhaeutl on the Combinations of Carbon with Silicon 

 and Iron and other Metals, forming the different species of 



Cast Iron, Steel, and malleable Iron (continued) 297 



Dr. Roget's Description of a Method of Moving the Knight 

 over every Square of the Chess-board, without going twice 

 over any one ; commencing at any given square, and end- 

 ing at any other given square of a different colour 305 



Mr. E. Solly's Observations on the Precipitation of Copper by 



Voltaic Electricity 309 



Mr. A. Smee on the Galvanic Properties of the Metallic 

 Elementary Bodies, with a Description of a new Chemico- 



]\Iechanical Battery 315 



M. Dumas's Memoir on the Law of Substitutions, and the 



Theory of Chemical Types 322 



Proceedings of the Royal Society 329 



. of the Royal Institution 338 



Theory of Substitutions. Pond Gas 339 



On Arsenic contained naturally in the Human Body 341 



Meteorological Observations for February, 1840 343 



Table 344 



NUMBER CIV.— MAY. 



Mr. Lyell on the Boulder Formation, or Drift and associated 

 Freshwater Deposits composing the Mud- Cliffs of Eastern 

 Norfolk 345 



Mr. R. Potter on the Method of performing the simple Experi- 

 ment of Interferences with two Mirrors slightly inclined, so 

 as to afford an experimentvm crucis as to the nature of Light 380 



Mr. Weaver on the Mineral Structure of the South of Ire- 

 land, with correlative matter onDevon andCornwall, Belgium, 

 the Eifel, &c. {continued) 388 



Mr. W.S. Harris on the Course of the Electrical Discharge, and 

 on the Effects of Lightning on certain Ships of the British 

 Navy (^continued) 404 



Dr. R. Kane's Remarks on the Compounds derived from the 

 Stearopten of Oil of Peppermint 418 



Mr, A. Smee on the Galvanic Properties of the Elementary 

 Bodies, and on the Amalgamation of Zinc 422 



Dr. C. Schafhaeutl on the Combinations of Carbon with Sili- 

 con and Iron, and other Metals, forming the different species 

 of Cast Iron, Steel, and Malleable Iron {continued) 426 



