CONTEXTS OF VOL. IV. SIXTH SERIES. Vll 



XUMBEB XXin.— NOVEMBER. 



Pa § e 

 Lord Bayleigh on the Distillation of Binary Mixtures 521 



Messrs. K. Honda. S. Shiraizu, and S. Kusakabe on the Change 



of the Modulus of Bigidity of Ferromagnetic Substances 



by Magnetization 537 



Mr. F. B. Jewett on a new Method of determining the 

 Vapour-Density of Metallic Vapours, and an Experi- 

 mental Application to the Cases of Sodium and Mercury. . 546 

 Mr. G. C. Simpson on the Electrical Kesistance of Bismuth 



to Alternating Currents in a Magnetic Field 554 



Dr. J. T. Bottomley on Badiation of Heat and Light from 



Heated Solid Bodies. (Plates V. & YI.) 560 



Prof. E. Butherford and Mr. F. Soddy on the Cause and 



Xature of Badioactivity. — Part II 569 



Mr. J. H. Jeans on the Conditions necessary for Eouipartition 



of Energy 585 



Hon. B. J. Strutt on the Electrical Conductivity of Metals 



and their Yapours 596 



Prof. B. AY. Wood on the Clay den Effect and Beversal of 



Spectrum Lines 606 



Dr. H. A. Wilson on the Current-Density at the Cathode in 



the Electric Discharge in Air 608 



Xotices respecting Xew Books : — 



Dr. E. B. Wilson's Yector Analysis, a Text-book for the 

 use of Students of Mathematics and Physics, founded 

 upon the Lectures of Professor J. Willard Gibbs .... 614 



Mrs. Ayrton's The Electric Arc 623 



Eugene Xeculcca's Le Phenomene de Kerr et les Phc- 

 nomenes Electro-Optiques 624 



NUMBEB XXIY.— DECEMBEB. 



Mr. William Sutherland on the Electric Origin of Molecular 

 Attraction , 625 



Messrs. K. Honda and S. Shimizu on the Vibration of Ferro- 

 magnetic Wires placed in a Varying Magnetizing Field . . G45 



Prof. J. Patterson on the Electrical Properties of Thin Metal 

 Films 652 



Lord Bayleigh : Does Motion through the iEther cause 

 Double Refraction ? • 67s 



Mr. J. A. Cunningham on the Discharge of Electricity through 

 Gases and the Temperature of the Electrodes 684 



Prof. E. Butherford and Mr. S. J. Allen on Excited Badio- 

 activity and Ionization of the Atmosphere 704 



