VI CONTENTS OF VOL. XIII. SIXTH SERIES. 



Page 

 Prof. E. T. Trouton and Mr. S. Euss on the Eate of Ee- 

 covery of Eesidual Charge in Electric Condensers. 



(Plate XV.) 578 



Mr. L. Vegard : Contributions to the Theory of Solutions . . 589 

 Mr. N. Campbell on the Effect of Change of Temperature on 



Spontaneous Ionization : 614 



Prof. J. de Kowalski on some Applications of the Theory of 



Electrons to the Theory of Phosphorescence 622 



Mr. U. Eehn: Some new Experiments with the Elame Tube . 627 

 Mr. A. Holt, Junr., on the Decomposition of Water Vapour 



in Contact with Hot Platinum Wire 630 



Mr. W. Ellis Williams on the Influence of Stress on the 



Electrical Conductivity of Metals 635 



Notices respecting New Books : — 



A. du Pre Denning's Eive Eigure Mathematical Tables 



for School and Laboratory Purposes 643 



The Science Tear-Book 644 



The Physical Laboratories of the University of Man- 

 chester : A record of 25 years' work 644 



The Teaching of Elementary Mechanics 645 



Leo Koenigsberger's Hermann von Helmholtz 645 



M. M. Pattison Muir's History of Chemical Theories and 



Laws 646 



H. Bouasse's Cours de Physique 647 



Proceedings of the Geological Society 647-655 



Intelligence and Miscellaneous Articles : — 



On a Simple Device for the Eecovery of Spilled Mercury, 

 by Will. C. Baker 656 



NUMBEE LXXVIII.— JUNE. 



Mr. G. A. Schott on the Eadiation from Moving Systems of 

 Electrons, and on the Spectrum of Canal Eays 657 



Prof. E. L. Hancock ou Eecovery of Nickel and Carbon Steel 

 from Overstrain. (Plate XVI.) 688 



Dr. C. V. Burton : Notes on JEther and Electrons 693 



Prof. L. T. More on the Eatigue of Metals subjected to 

 Eontgen Eadiation 708 



Dr. A. H. Bucherer on the Action of Uniform Electric and 

 Magnetic Eields on Moving Electrons 721 



Prof. K. Olszewski on Temperature of Inversion of the Joule- 

 Kelvin Effect for Air and Nitrogen 722 



Prof. A. W. Porter on the Isopiestic Temperatures of Saturated 

 Vapours of Different Substances 724 



Sir Oliver Lodge on the iEther and on the Hypothetical 

 Magnetic Plow 727 



Mr. A. E. Garrett on Electrical Conductivity produced by 

 Heating Salts 728 



