﻿CONTENTS OF VOL. XXIX. SIXTH SERIES. 



NUMBER CLXXL— MARCH. 



Page 



Mr. A. Fleck on the Condensation of Thorium and Radium 

 Emanations 337 



Mr. F. Lloyd Hopwood on a Qualitative Method of Investi- 

 gating Thermionic Emission 362 



Dr. Norman Campbell on the Ionization of Metals by Cathode 

 Rays 369 



Mr. Gr. H. Livens on the Law of Partition of Energy and 

 Newtonian Mechanics 383 



Dr. Genevieve V. Morrow on Displacements in certain 

 Spectral Lines of: Zinc and Titanium 391 



Prof. W. H. Bragg on the Relation between certain X-ray 

 Wave-lengths and their Absorption Coefficients 407 



Mr. H. Pealing on Condensation Nuclei produced by the 

 Action of Light on Iodine Vapour 413 



Prof. S. Kinoshita and Mr. H. Ikeuti on the Tracks of the 

 a Particles in Sensitive Photographic Films. (Plate VII.) 420 



Mr. G-. H. Livens on the Electron Theory of Metallic Con- 

 duction. — II 425 



Notices respecting New Books : — 



Mr. Heyward Scudder's The Electrical Conductivity and 

 ionization Constants of Organic Compounds 432 



NUMBER CLXXIL— APRIL. 



Lord Rayleigh on JEolian Tones . . . . 433 



Mr. Gr. B. Jeffery on the Equations of Motion of a Viscous 

 Fluid 445 



Mr. G. B. Jeffery on the Two-Dimensional Steady Motion 

 of a Viscous Fluid 455 



Prof. D. N. Mallik on the Theory of Dispersion 465 



Mr. J. H. J. Poole on the Average Thorium Content of the 

 Earth's Crust 483 



Dr. J. H. Vincent and Mr. C. AV. Jude on the Duplex 

 Harmonograph. (Plate VIII.) 490 



Prof. J. A. Pollock on the Nature of the Large Ions in the 

 Air 514 



Mr. W. Ellis Williams on the Motion of a Sphere in a 

 Viscous Fluid. (Plate IX.) 526 



Dr. A. O. Ranldne on. the Relative Dimensions of 

 Molecules , 552 



Prof. Louis Vessot King on the Precision Measurement of 

 Air Velocity by means of the Linear Hot-Wire Anemo- 

 meter. (Plate X.) 556 



