iv CONTENTS OF VOL. XXXIX. FIFTH SERIES. 



Page 

 Influence of Magnetic Fields on the Electrical Conductivity of 



Bismuth, by James B. Henderson 143 



On the Influence of Temperature on the Specific Heat of 



Aniline, by E. H. Griffiths 143 



On the Dielectric Power of Ice, by M. A. Perot 144 



On the Refraction and Dispersion of Electrical Kays, by E. 



Garbasso and E. Aschkinass 144 



NUMBER CCXXXVIL— FEBRUARY. 



Dr. S. Tolver Preston's Comparative Review of some Dyna- 

 mical Theories of Gravitation 145 



Prof. W. E. Ayrton and Mr. H. C. Haycraft on a Students' 

 Simple Apparatus for Determining the Mechanical Equiva- 

 lent of Heat 160 



Mr. E. Womack on a Modification of the Ballistic-Galvano- 

 meter Method of Determining the Electromagnetic Capacity 



of a Condenser 172 



Prof. A. Schuster's Electrical Notes 175 



Prof. H. Hennessy ou Ronayne's Cubes 183 



Prof. Dr. Charles Olszewski on the Liquefaction of Gases . . 188 

 Prof. Silvanus P. Thompson and Mr. Miles "Walker on Mirrors 



of Magnetism 213 



Notices respecting New Books : — 



Prof. W. Ostwald's Die wissenscbaftlichen Grundlagen 



der Analytischen Chemie 225 



On the Chauge of Length in Soft Iron Wire placed in a 

 Uniform Magnetic Field, by B. Rosing 226 



NUMBER CCXXXYIIL— MARCH. 



Mr. Albert Griffiths on some Experiments with Alternating 

 Currents 229 



Mr. E. Taylor Jones on Electromagnetic Stress 254 



Mr. Alfred W. Porter on the Influence of the Dimensions of 

 a Body on the Thermal Emission from its Surface 268 



Mr. N. Eumorfopoulos on the Determination of Thermal 

 Conductivity and Emissivity 280 



Prof. R. Threlfall on the Clark Cell when Producing a Current. 295 



Mr. Charles E. St. John on the Value of the Magnetic Perme- 

 ability for Rapid Electrical Oscillations 297 



Prof. J. Dewar on the Liquefaction of Gases 298 



