CONTENTS OF VOL. XX. SIXTH SERIES. 



NUMBER CXVIL— SEPTEMBER. 



Page 



Prof. W. H. Bragg on the Consequences of the Corpuscular 

 Hypothesis of the y and X Rays, and the Range of 

 /3 Rays 385 



Prof. Silvanus P. Thompson on Hysteresis Loops and Lis- 

 sajous'* Eigures, and on the Energy wasted in a Hysteresis 

 Loop. (Plate VI.) ' 417 



Mr. J. Prescott on the Precise Effect of Radial Eorces in 

 opposing the Distortion of an Elastic Sphere 437 



Mr. A. E. H. Love : Note on the preceding Paper 443 



Dr. R. D. Kleeman on the Shape of the Molecule 445 



Lord Rayleigh on the Finite Vibrations of a System about 

 a Configuration of Equilibrium 450 



Prof. Edwin H. Barton and Mr. T. E. Ebble white : Vibration 

 Curves of Violin Bridge and Strings. (Plates VII. -IX.) . 456 



Mr. J. J. Lonsdale on the Ionization produced by the 

 Splashing of Mercury , 464 



Prof. W. J. Lewis : Wiltshireite : a New Mineral 474 



Dr. C. Chree : Discussion of Results obtained at Kew Ob- 

 servatory with Elster and Geitel Electrical Dissipation 

 Apparatus from 1907 to 1^09 475 



Mr. W. J. Harrison on the Stability of Superposed Streams 

 of Viscous Liquids 493 



Dr. Win. C. McC. Lewis on the Nature of the Transition 

 Layer between Two Adjacent Phases 502 



Prof. Alfred W. Porter on the Lagging of Pipes and Wires : 

 with an Addendum in conjunction with Mr. E. R. Martin . 511 



Mr. D. Tyrer on the Relations between the Physical Pro- 

 perties of Liquids at the Boiling-Point 522 



Dr. W. H. Eccles on the Energy Relations of Certain De- 

 tectors used in Wireless Telegraph}*. (Plate X.) 533 



Mr. G. W. de Tunzelmann on the Mechanical Pressure of 

 Radiation effective on the smallest as well as larger 

 Particles 538 



Notices respecting New Books : — 



Sir William Thomson's (Baron Kelvin) Mathematical 



and Physical Papers. Vol. IV 540 



Mr. H. Crabtree's Elementary Treatment of the Theory 



of Spinning Tops and Gyroscope Motion 542 



Dr. E. Jahnke and E. Emde's Eunktionentafeln mit 

 Eormeln mid Kurven 542 



Proceedings of the Geological Society 5-13 



Intelligence and Miscellaneous Articles : — 



On the Motion of an Electrified Particle near an 

 Electrical Doublet, by Sir J. J. Thomson 544 



