CONTENTS of N° 238.— Fifth Series. 



XXIII. Some Experiments with Alternating Currents. By 

 Albeet Griffiths, M.Sc, Berkeley Fellow of Owens College, 

 Manchester p a 9 e 229 



XXIV. On Electromagnetic Stress. By E. Taylor Jones, 

 B.Sc, Science Scholar of Royal Commission for Exhibition of 1851, 

 nominated by the University College of N. Wales 254 



XXV. On the Influence of the Dimensions of a Body on the 

 Thermal Emission from its Surface. By Alfred W. Porter, 

 B.Sc, Demonstrator of Physics, University College, London .... 268 



XXVI. On the Determination of Thermal Conductivity and 

 Emissivity. By N. Eumorfopoulos, B.Sc, Demonstrator in 

 Physics, University College, London 280 



XXVII. The Clark Cell when Producing a Current, By Prof. E. 

 Threlfall 295 



XXVIII. Value of the Magnetic Permeability for Eapid Elec- 

 trical Oscillations. By Charles E. St. John 297 



XXIX. On the Liquefaction of Gases. By Prof. J. Dewar. . . . 298 



XXX. Notices respecting New Books : — Mr. W. Crookes' 

 Select Methods in Chemical Analysis (chiefly Inorganic) ; Claudius 

 Kennedy's A Eew Chapters in Astronomy 305, 307 



XXXI. Intelligence and Miscellaneous Articles : — 



An Experiment with Solid Carbonic Acid, by Prof. K. Prytz. . 308 



*** It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



