CONTENTS OF VOL. IV. SIXTH SERIES. V 



NUMBER XXI.— SEPTEMBER. 



Page 



Lord Kelvin on the Weights of Atoms 281 



Prof. W. B. Morton on the Eorms of the Lines of Electric 

 Force and of Energy Elux in the neighbourhood of Wires 



leading Electric Waves 302 



Prof. E. Rutherford and Mr. A. G. Grier on Deviable Rays of 



Radioactive Substances 315 



Mr. T. C. Porter on the Ebullition of Rotating Water.— A 



Lecture Experiment 330 



Prof. J. D. Everett on the Comparison of Vapour-Temperatures 



at Equal Pressures 335 



Messrs. K. Honda and S. Shimizu on the Change of Length 

 of Ferromagnetic Wires under Constant Tension by 



Magnetization 338 



Messrs. Ed\vin Edser and Edgar Senior on the Diffraction of 

 Light from a Dense to a Rarer Medium, when the Angle 



of Incidence exceeds its Critical Value 310 



P. of. J. J. Thomson: Experiments on Induced-Radioactivity 

 in Air, and on the Electrical Conductivity produced in 



Gases when they pass through Water 352 



Prof. J. Larmor on the Influence of Convection on Optical 



Rotatory Polarization 307 



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



Nature of Radioactivity. — Part 1 370 



Prof. R. \V. Wood on a Remarkable Case of Uneven Distri- 

 bution of Light in a Diffraction Grating Spectrum 390 



Prof. W. Cassie on the Measurement of Young's Modulus . . 402 

 Dr. G. Johnstone Stonev on the Law of Atomic Weights. 



(Plate IV.) " 411 



Notices respecting New Books :— 



Science Abstracts 410 



Proceedings of the Geological Society: — 



Prof. S. H. Reynolds and Mr. C. I. Gardiner on the Fos- 



siliferous Silurian Beds of the Clogher Head District . . 410 

 Prof. W. J. Sollas on a Process for the Mineral Analysis 



of Rocks 417 



Rev, E. Hill on the Matrix of the Suffolk Chalky 



Boulder-Clay , 418 



Prof. T. G. Bonney on the Relation of certain Breccias 



to the Physical Geography of their Age 419 



Mr. E. A. Walford on some Gaps in the Lias 420 



Mr. A. Strahan on the Origin of the River-System of 



South Wales 421 



Mr. A. K. Ooomaraswamy on the Crystalline Limestones 



of Ceylon 421 



Rev. J. F. Blake on a remarkable Inlier among the 



Jurassic Rocks of Sutherland 423 



Mr. A. J. Jukes-Browne on a Deep Boring at Lyme 

 Regis 424 



