CONTENTS OF VOL. XXV. SIXTH SERIES. V 



NUMBEE CXLVIL— MAECH. 



Page 

 Prof. H. N. McCoy and Dr. C. H. Yiol : The Chemical 

 Properties and Eelative Activities of Eadio-Products of 



Thorium 333 



Mr. J. Crosby Chapman : Production of Fluorescent Bontgen 



Eadiatiou 359 



Prof. C. Sheard on the Ionization produced by Heated Salts . 370 

 Dr. Gr. von Hevesy on the Valency of the Eadioelements . . 390 

 Dr. Gr. von Hevesy and L. von Putnoky on the Diffusion of 



Urauium 415 



Mr. H. Pealing on an Anomalous Variation of the Rigidity 



of Phosphor-Bronze 418 



Prof. H. M. Macdonald on the Electrical Vibrations associated 



with thin terminated Conducting Kods 427 



Notices respecting New Books : — 



Annuaire pour l'an 1913 428 



Dr. T. Muir's The Theory of Determinants in the 



Historical Order of Development 429 



A. L. Day & E. B. Sosman's High Temperature Gas 



Thermometry 429 



Tables Annuelles de Constantes et Donnees numeri- 



ques de Chimie, de Physique et de Technologie 429 



Theoretische Astronomie von Dr. W. Klinkerfues, 3rd 

 Edition, bv Dr. H. Buchholz 430 



NUMBEE CXLVIIL— APEIL. 



Prof. E. W. Wood on the Selective Dispersion of Mercury 



Vapour at the 2536 Absorption Line. (Plate III.) .... 433 

 Prof. E. W. Wood : Eesonance Experiments with the Longest 



Heat- Waves. (Plate III.) 440 



Prof. E. W. Wood on the Satellites of the Mercury Lines. 



(Plate IV.) 443 



Prof. E. W, Wood on the Imprisonment of Eadiation by 



Total Eeflexion 449 



Dr. B. Hodgson on the Temperature of the Cathode and 



Anode in a Geissler Tube 453 



Mr. H. Smith : A Spectroscopic Study of the Electric Brush 



Discharge in Water and Salt Solutions. (Plate V.) .... 461 

 Mr. D. L. Chapman : A Contribution to the Theory of Elec- 



trocapillarity 475 



Prof. W. A. Douglas Eudge on the Electrification associated 



with Dust-Clouds. (Plates VI. & VII.) 481 



Mr. J. D. Ery on a New Micromanometer 494 



Mr. Allan Ferguson on certain Small Corrections in a 



Newton's-rings System 501 



Mr. Allan Eergusou on the Theoretical Shape of Lnrge Bub- 

 bles and Drops, with other Allied Problems. (Plate VIII.) 507 



