VI CONTENTS OF VOL. XXVI. — FIFTH SERIES. 



Mr. O. Heaviside on Electromagnetic Waves, especially in 

 relation to the Vorticity of the Impressed Forces ; and the 

 Forced Vibrations of Electromagnetic Systems 360 



Prof. J. Thomson on Elux and Reflux of Water in Open 

 Channels or in Pipes or other Ducts 382 



Mr. E. Wilson on the Law of Dispersion 385 



Notices respecting New Books : — 



Mr. J. Prestwich's Geology 389 



Photography of the Least Refrangible portion of the Solar 

 Spectrum, by J. C. D. Burbank 391 



On the Disintegration of Ignited Platinum, by H. Kayser . . 393 



OnEreezing-mixturesmade with Solid Carbonic Acid, by MM. 

 Cailletet and E. Colardeau 394 



A Simple Pendulum Experiment to explain Resonance and 

 Absorption, by W. Holtz 396 



NUMBER CLXIL— NOVEMBER. 



Mr. C. Barus on the Secular Annealing of Cold Hard Steel . . 397 



Prof. R. Meldola on Evidence of the Quanti valence of Oxygen 

 derived from the Study of the Azo-Naphthol Compouuds. . 403 



Sir W. Thomson on the Reflexion and Refraction of Light . . 414 



Mr. J. E. Marsh on Van't Hoffs Hypothesis and the Con- 

 stitution of Benzene 426 



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

 lation to the Vorticity of the Impressed Eorces ; and the 

 Eorced Vibrations of Electromagnetic Systems 434 



Mr. A. Tanakadate on the Mean Intensity of Magnetization of 

 Soft Iron Bars of Various Lengths in a Uniform Magnetic 

 Eield. (Plates IV. & V.) 450 



Rev. R. Harley on the General Quartine, or the Incriticoid of 

 the Eourth Degree 456 



Mr. T. H. Blakesley on a New Barometer, called "the 

 " Amphisbama " 458 



Notices respecting New Books : — 



MM. E. Amoretti and C. M. Morales' Teoria elemental 

 de las Determinantes, y sus principales aplicaciones al 



Algebra y la Geometria 461 



Dr. W. G. Peck's Elementary Treatise on Determinants. 461 

 Annual Report of the Geological and Natural-History 

 Survey of Canada. New Series. Vol. II. (for 1886). 464 



Action of Electricity on the Vesicles of Condensed Water, by 

 J. L. Soret 465 



On some Phenomena of Mirage, by J. L. Soret 466 



On the Changes in the Specific Heat of Liquids near the 

 Critical Temperature, by P. de Heen 467 



Electroscope for purposes of Demonstration, by B. Kolbe . . 467 



On the Velocity of Sound in Liquids, by T. Martini 468 



