VI CONTENTS OF VOL. XL. FIFTH SERIES. 



NUMBEE CCXLV.— OCTOBER. 



Page 

 Mr. Walter Hibbert on the Gladstone " Law " in Physical 



Optics, and the True Volume o£ Liquid Matter 321 



Dr. Louis Trenchard More on the Changes in Length pro- 

 duced in Iron Wires by Magnetization 345 



Dr. George Johnstone Stoney on the Kinetic Theory of Gas, 



regarded as illustrating Nature 362 



Mr. Harry C. Jones on the Cryoscopic Relations of Dilute 



Solutions of Cane-Sugar and Ethyl Alcohol 383 



Notices respecting New Books : — 



Dr. Andreas Eock's Introduction to Chemical Crystallo- 

 graphy 393 



Proceedings of the Geological Society : — ■ 



Mr. G. W. Lamplugh on the Crush-Conglomerates of 



the Isle of Man 394 



A Simple Method of Determining the Duration of Torsional 



Oscillations, by E. W. Wood 395 



On the Inconstancy of the Potential required for a Spark, by 

 G. Jaumann 396 



NUMBEE CCXL VI.— NOVEMBER. 



Mr. E. A. Lehfeldt on the Properties of a Mixture of 



Liquids , 397 



Mr. E. A. Waterman on an Improved Calorimeter for the 



Application of the Method of Mixtures 413 



Mr. William Sutherland on the Viscosity of Mixed Gases . . 421 

 Mr. E. H. Griffiths on the Thermal Unit. (Plates VI. & 



VII.) 431 



Thaddeus Estreicher on the Pressures of Saturation of 



Oxygen * 454 



Dr. Charles H. Lees on a Simple Geometrical Construction 



for finding the Intensity of Illumination at any Point of a 



Plane due to a Small Source of Light symmetrical about 



an Axis perpendicular to that Plane -. 463 



Mr. Henry Wilde on Helium, and its place in the Natural 



Classification of Elementary Substances. (Plate VIII.) . . 466 

 Mr. Spencer Umfreville Pickering on Self-recorded Breaks in 



the Properties of Solutions 472 



Measurements with Alternating Currents of High Erequency, 



by Dr. Josef Tuma 476 



