CONTENTS OF VOL. XLI. SIXTH SERIES. V 



Page 

 Prof. A. W. Porter and Mr. R. E. Gibbs on Systems with 



Propagated Coupling .' . 432 



Mr. J. H. Shaxby on Vapour Pressures and the Isothermals of 



Vapours • ■ - • 441 



Prof. W. A. Jenkins on the Determination of "H " 454 



Mr. J. D. Morgan on Impulsive Sparking Voltages in small 



gaps 462 



Mr. G. Stead on the Design of Soft Thermionic Valves, 



(Plate VIII.) . . . 470 



Mr. A. Lienard on a Method of finding the Scalar and Vector 



Potentials due to the Motion of Electric Charges 483 



Messrs. W. E. Garner and Irvine Masson on the Activity of 



Water in Sucrose Solutions 484 



Mr. C. Gr. Darwin on the Collisions of a-Particles with 



Hydrogen Nuclei 486 



Sir J: J. Thomson on the Structure of the Molecule and 



Chemical Combination , 510 



Mr. A. Gilmour on the Resistance of Solutions of Copper 



Sulphate in Glycerine 544 



NUMBER CCXLIV.— APRIL. 



Sir Oliver Lodge on the Supposed Weight and Ultimate Pate 



of Radiation 549 



Prof. L. Vegard on the Spectrum of Plydrogen Positive Rays. 558 

 Mr. G. P. Thomson on the Spectrum of Hydrogen Positive 



Rays . . 566 



Prof. C. Batho on the Torsion of Closed and Open Tubes ; with 



a Note by J. Prescott 568 



Sir E. Rutherford on the Mass of the Long-range Particles 



from Thorium C 570 



Dr. A. B. Wood on Long-range Particles from Thorium Active 



Deposit, 575 



Mr. W. L. Cowley and Dr. H. Levy on a Method of Analysis 



suitable for the Differential Equations of Mathematical 



Physics ' 584 



Mr. J. R. Carson on Wave Propagation over Parallel Wires : 



The Proximity Effect 607 



Mr. A. E. Dufton on the Separation of Miscible Liquids by 



Distillation 633 



Mr. E. Tavani on Motion and Hyperdimensions 647 



Prof. E. Slate on Eorce-Transformation, Proper Time, and 



Eresnel's Coefficient 652 



Dr. G. Green on Some Problems relating to Rotating Fluid 



in the Atmosphere 6(>5 



Mr. Elis Hjalmar on Precision-measurements in the X-Eav 



Spectra. Part IV. — K-Series, the Elements Cu — Na .... 675 



