CONTENTS OP VOL. XXV. FIFTH SERIES. V 



Page 

 Mr. F. Y. Edge worth on a New Method of reducing Obser- 

 vations relating to Several Quantities 184 



M. E. van Aubel on the Influence of Magnetism and Tempe- 

 rature on the Electrical Resistance of Bismuth and its Alloys 



with Lead and Tin 191 



Mr. O. Heaviside's Note on a Paper on Electromagnetic 



Waves 202 



Mr. T. M. Eeade on the Geological Consequences of the Dis- 

 covery of a Level-of -no-Strain in a Cooling Globe 210 



Prof. J. D. Everett on the General Laws of Brightness of 



Images 216 



Mr. J. F. Heyes on the Tetravalency of Oxygen ; with Re- 

 marks on the Varying Valency of the Elements and the 



Present Chemical Aspect of the Valency Problem 221 



Proceedings of the Geological Society : — 



Prof. J. Prestwich on the Correlation of some of the 

 Eocene Strata in the Tertiary Basins of England, 



Belgium, and the North of France 238 



Prof. J. F. Blake on the Cambrian and Associated Bocks 



in North-west Caernarvou shire 239 



Mr. R. D. Oldham on the Law that governs the Action 



of Flowing Streams 240 



Rev. A. Irving on the Stratigraphy of the Bagshot 



Beds of the London Basin 241 



Rev. A. Irving on the Red-Rock Series of the Devon 



Coast Sectiou , 241 



An Experiment on the Emission of Light by Ignited Bodies, 



by F. Braun 242 



On Capillary Analysis : a Method of Separating and Recog- 

 nizing Individual Colouring-matters in their Mixtures, by 



F. Goppelsroder 244 



On the Convection of Electricity by Evaporation, by Dr. E. 

 Lecher 244 



NUMBER CLV.— APRIL. 



Mr. Louis Bell on the Absolute Wave-length of Light 245 



Hon. R. Abercromby on the Height, Length, and Velocity of 



Ocean Waves 263 



Dr. T. S. Hunt on the Integral Weight of Water 269 



Dr. H. W. Watson on the Electromotive Force in Moving 



Conductors 271 



Prof. J. Young's Sketch of a Stratigraphical Table, chiefly for 



Western Europe 274 



Messrs. W. W. H. Gee and H. Holden's Experiments on 



Electrolysis. — Part I. Change of Density of the Electrolyte 



at the Electrodes 276 



