IV CONTENTS OF VOL. XXV. FIFTH SERIES. 



Dr. A. Geikie on the Age of the Altered Limestone of 



Strath, Skye 73 



On Electricity produced by the Friction of Drops, by J. Elster 



and H. Geitel 75 



A New Instrument for the Measurement of Eadiation, by C. 



C. Hutchins 76 



Apparatus for Illustrating the Tall of Bodies in a Vacuum, 



by J. Puluj 77 



Attempt to Apply the Diffusion of G-ases and Vapours through 



Porous Bodies to Determining the Amount of Moisture and 



Carbonic Acid in the surrounding Air, by F. Schidlowsky . . 77 

 On Electrical Transportation in Liquids, by S. Tereschin .... 78 

 Electrical Impressions, by K. Tschechowitsch 80 



IN UMBER CLIIL— FEBRUARY. 



Prof. L. Boltzmann on some Questions in the Kinetic Theory 

 of Gases 81 



Mr. H. Tomlinson on the Recalescence of Iron 103 



Sir W. Thomson on Cauchy's and Green's Doctrine of Extra- 

 neous Force to explain dynamically FresueFs Kinematics of 

 Double Refraction 116 



Mr. S. H. Burbury on the Diffusion of Gases ; a Reply to 

 Professor Tait 129 



Mr. O. Heaviside on Electromagnetic Waves, especially in re- 

 lation to the Vorticity of the Impressed Forces ; and the 

 Forced Vibrations of Electromagnetic Systems 130 



Mr. R. M. Deeley on a Theory of Glacier Motion 156 



On the Influence of Light upon the Electric Discharge, by 

 E. Wiedemann and H. Ebert 162 



Application of the Deci-ampere or Centi-ampere Balance to 

 the Determination of the Electromotive Forces of Voltaic 

 Cells 164 



NUMBER CLIV.— MARCH. 



Mr. J. Buchanan on a Law of Distribution of Molecular 



Velocities amongst the Molecules of a Fluid 165 



Prof. S. P. Thompson on the Price of the Factor of Safety in 



the Materials for Lightning-rods 170 



Prof. P. G. Tait on some Questions in the Kinetic Theory of 



Gases : reply to Prof. Boltzmann 172 



Mr. T. Gray on the Application of the Electrolysis of Copper 



to the Measurement of Electric Currents 179 



