IV CONTENTS OF VOL. XXVII. SIXTH SERIES. 



Page 

 Prof. G. W. O. Howe on the Effect of Ionization of Air on 

 Electrical Oscillations, and its bearing on Long-Distance 



Wireless Telegraphy 213 



Mr. E. Soddy on the Existence of Uranium T. (Plate II.). . 215 

 Notices respecting New Books : — 



Researches of the U.S. Department of Terrestrial 



Magnetism. Land Magnetic Observations 1905-1910 222 

 Mr. W. Makower and Dr. H. Geiger's Practical Measure- 

 ments in Radio-activity 222 



Proceedings of the Geological Society 223 



NUMBER CLYIIL— EEBRUARY. 



Mr. D. C. H. Elorance on Secondary y Radiation 225 



Prof. E. P. Adams on some Electromagnetic Effects related 



to the Hall Effect 244 



Mr. H. Richardson : Analysis of the y Rays from the Uranium 



Products 252 



Prof. W. Peddie on the Structure of the Atom 257 



Prof. J. S. Townsend on the Energy required to Ionize a 



Molecule by Collision 269 



Mr. C. W. H. Eoord on Air-Pressures used in Playing Reed 



Instruments. (Plate III.) 271 



Mr. C. D. Child on Ionization in the Unstriated Discharge 



and in the Arc 277 



Mr. W. J. Walker on the Relationship between the Viscosity, , 



Density, and temperature of Salt Solutions. (Plate IV.) . . 288 

 Mr. H. A. M c Taggart on the Electrification at Liquid- Gas 



Surfaces 297 



Mr. C. G. Darwin on the Theory of X-Ray Reflexion 315 



Prof. H. Nagaoka and Mr. T. Takamine : Anomalous Zeeman 



Effect in Satellites of Mercury Lines. (Plate V.) 333 



Mr. Gervaise Le Bas on the Theory of Molecular Volumes. . 344 

 Dr. J. R. Ashworth on the Anhysteretic Magnetic Properties 



of Iron and Nickel. — Part I. The Relation of Magnetic 



Intensity to Eield Strength and Temperature 357 



Mr. G. W. White on the Properties of Selenium Blocks .... 370 

 Dr. E. H. Barton on Ionization and Wireless Telegraphy . . 381 

 Dr. H. A. Wilson on the Distribution of Scattered Rontgen 



Radiation 383 



Mr. J. R. Wilton on Deep Water Waves 385 



Prof. A. S. Eve on the Number of Ions produced by the 



Gamma Radiation from Radium 394 



Notices respecting New Books: — 



Annals of the Astrophysical Observatory of the Smith- 

 sonian Institution, Vol. Ill 396 



