VI CONTENTS OF VOL. XXX. FIFTH SERIES. 



Page 

 On the Theory of the Oscillatory Discharge, by Prof. J. Stefan 282 

 Calorimetrical Observations on the Disengagement of Heat 



and Light in Electrical Discharges, by G-. Staub 283 



Observations on Atmospheric Electricity in the Tropics, by 



Prof. F. Exner 284 



Investigation of Electrical Vibrations with Thermo-elements, 



bv Dr. Ignatius Klemencic 284 



N UMBER CLXXXV.— OCTOBER. 



Lord Rayleigh on the Theory of Surface Eorces 285 



Mr. S. H. Burbury on some Problems in the Kinetic Theory 



of Gases " 298 



Mr. W. Sutherland on a New Periodic Property of the 



Elements 318 



Messrs. J. Trowbridge and W. C. Sabine on Electrical Oscil- 

 lations in Air 323 



H. E. J. G. du Bois on Magnetic Circuits 335 



Mr. Carl Bar as on the Isometrics of Liquid Matter. (Plates IX., 



X., XL) 338 



The Magneto-Optical Generation of Electricity, by S. Sheldon 361 

 On the Observation of Electrodynamic Waves, by E. Wiechert 363 

 Contributions to the Demonstration of Hertz's Experiments, 

 by G. Bartaniek 364 



NUMBER CLXXXVL— NOVEMBER, 



Messrs. H. E. J. G. du Bois and H. Rubens on Refraction and 



Dispersion in certain Metals. (Plate XII.) 365 



Mr. J. Joly on a Method of Determining the Absolute 



Density of a Gas 379 



Lord Rayleigh on the Tension of Water Surfaces, Clean and 



Contaminated, investigated by the Method of Ripples .... 386 

 Mr. S. U. Pickering on the Expansion of Water and other 



Liquids. (Plates VII. & VIII.) 400 



Prof. O. Masson on the Relation between the Boiling-Points, 



Molecular Volumes, and Chemical Characters of Liquids . . 412 

 Prof. S. Young on the Relation between the Boiling-points, 



Molecular Volumes, and Chemical Characters of Liquids . . 423 

 Mr. J. Bridge on the Measurement of Astigmatism and some 



other Ocular Defects 427 



Messrs. J. A. Wanklyn and W. J. Cooper on Hydrogen Gas. . 431 

 Notices respecting New Books : — 



Dr. Baker's Elliptic Functions, an Elementary Text-book 

 for Students of Mathematics 134 



