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SIR OLIVER JOSEPH LODGE, D.Sc., LL.D., F.R.S.
SIR JOSEPH JOHN THOMSON, O.M., M.A., Sc.D., LL.D., F.R.S.
JOHN JOLY, M.A., D.Sc., F.R.S., F.G.S.
GEORGE CAREY FOSTER, B.A., LL.D., F.R.S.

AND

WILLIAM FRANCIS, F.L.S.

Nec aranearum sane textus ideo melior quia ex se fila gignunt, nec noster
vilior quia ex alienis libamus ut apes." JUST. Laps. Polit. lib. i. cap. 1. Not.

VOL. XXX.-SIXTH SERIES.
JULY-DECEMBER 1915.

LONDON:

TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET.

SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD.
SMITH AND SON, GLASGOW ;— HODGES, FIGGIS, AND CO., DUBLIN;—
AND VEUVE J. BOYVEAU, PARIS.

"Meditationis est perscrutari occulta; contemplationis est admirari perspicua.... Admiratio generat quaestionem, quæstio investigationem, investigatio inventionem."-Hugo de S. Victore.

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CONTENTS OF VOL. XXX.

(SIXTH SERIES).

NUMBER CLXXV.-JULY 1915.

Dr. G. C. Simpson on the Electricity of Atmospheric Pre-

Mr. R. M. Deeley on the Theory of the Winds..

Messrs. C. C. Paterson and B. P. Dudding on the Estima-

tion of High Temperatures by the Method of Colour

Pago

Messrs. C. C. Paterson and B. P. Dudding on the Unit of

Candle-power in White Light

Dr. C. V. Burton on the Scattering and Regular Reflexion of

Light by Gas Molecules.-Part II...

Mr. G. H. Livens on the Number of Electrons concerned in

Metallic Conduction ...

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

Prof. W. M. Thornton on the Electric Strength of Solid

Dielectrics.....

Prof. P. J. Daniell on the Coefficient of End-Correction.-

Mr. G. von Kaufmann on the General Theory of Corre-

sponding States, and the Thermodynamic State-Equation. 146

Dr. L. Silberstein on Radiation from an Electric Source.

Lord Rayleigh on the Resistance experienced by Small Plates

exposed to a Stream of Fluid

Mr. T. Harris on the Distribution of Electric Force in the

Discharge at Low Pressures

Sir J.J. Thomson on Conduction of Electricity through Metals. 192

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

of Phosphor Bronze when in the form of Strips

Notices respecting New Books :--

Dr. C. G. Knott's Physics, an elementary text-book for

University Classes

Dr. H. Stanley Allen's Photoelectricity: The Liberation

of Electrons by Light

NUMBER CLXXVI.-AUGUST.

Prof. F. Soddy and Miss A. F. R. Hitchins on the Relation

between Uranium and Radium.-Part VI. The Life-period

Miss Jadwiga Szmidt (Petrograd) on the Excitation of y Rays

Prof. E. Taylor Jones on the most Effective Primary Capacity

for Induction-coils and Tesla Coils .....

Prof. E. Marsden and Mr. W. C. Lantsberry on the Passage

of a Particles through Hydrogen.—II.

Mr. K. F. Nesturch on the Probability of Ionization and

Radiation of Gas Molecules due to Collision with Electrons. 244

Prof. P. J. Daniell on the Coefficient of End-Correction.—

Dr. A. C. Crehore on Construction of the Diamond with

Theoretical Carbon Atoms

Mr. E. H. Smart on the Third-Order Aberrations of a Sym-

metrical Optical Instrument

Mr. W. G. Brown on Reflexion from a Moving Mirror

Prof. W. B. Morton and Mr. J. Vint on the Paths of the

Particles in some cases of Motion of Frictionless Fluid

in a Rotating Enclosure. (Plates I. & II.) . . .

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

duction.-IV. ....

Prof. O. W. Richardson on Metallic Conduction

Prof. R. W. Wood: Experimental Determination of the

Law of Reflexion of Gas Molecules. (Plate III.) ... 300

Prof. W. H. Bragg on the Structure of the Spinel Group of

Mr. C. E. Mendenhall and Prof. R. W. Wood on the Effect

of Electric and Magnetic Fields on the Emission Lines of

Solids. (Plate IV.).

NUMBER CLXXVII.—SEPTEMBER.

Sir J. J. Thomson on the Mobility of Negative Ions at Low

Lord Rayleigh on the Stability of the Simple Shearing Motion

of a Viscous Incompressible Fluid

Sir E. Rutherford, Prof. J. Barnes, and Mr. H. Richardson

on Maximum Frequency of the X Rays from a Coolidge

Tube for Different Voltages

Sir E. Rutherford and Prof. J. Barnes on the Efficiency of

Production of X Rays from a Coolidge Tube..

Prof. J. Barnes on the High-Frequency Spectrum of Tungsten. 368

Dr. L. Silberstein on Mutual Electromagnetic Mass...

Prof. E. P. Harrison and Mr. Sujit K. Chakravarti on the

Temperature Coefficient of Young's Modulus for Electrically

Heated Iron Wire

Prof. Frank Horton on the Zeleny Electroscope

Prof. W. M. Thornton on the Total Radiation from a Gaseous

Prof. W. G. Duffield: A Comparison of the Arc and Spark

Spectra of Nickel produced under Pressure; with a Note

upon the Influence of Temperature and Density Gradients.

upon the Displacements of Spectrum Lines

Dr. N. Bobr on the Quantum Theory of Radiation and the

Structure of the Atom . . . . .

Prof. J. C. McLennan and Mr. C. L. Treleaven on Residual

Ionization in Gases

Prof. J. C. McLennan and Mr. H. G. Murray on the Residual

Ionization in Air enclosed in a vessel of Ice. (Plate V.).. 428

Mr. G. H. Livens on the Electron Theory of the Optical

Properties of Metals.-II.

Notices respecting New Books :-

Calculus Made Easy

Proceedings of the Geological Society :-

Prof. T. McKenny Hughes on the Gravels of East Anglia 445

Messrs. E. M. Anderson and E. G. Radley on the Pitch-

stones of Mull and their Genesis

Mr. H. S. Shelton on the Radioactive Methods of Deter-

mining Geological Time

NUMBER CLXXVIII.-OCTOBER.

Mr. C. F. Meyer and Prof. R. W. Wood: A Further Study

of the Fluorescence produced by Ultra-Schumann Rays.

Mr. E. Talbot Paris on the Polarization of Light scattered by

Spherical Metal Particles of Dimensions comparable with

the Wave-length ...

Prof. J. C. McLennan and Mr. Evan Edwards on the Ultra-

violet Spectrum of Elementary Silicon

Prof. J. C. McLennan and Mr. D. A. Keys on the Mobilities

of Ions in Air at High Pressures

Prof. J. C. McLennan and Mr. C. G. Found on the Delta

Radiation emitted by Zine when bombarded by Alpha Rays.

(Plate VII.) .....

Mr. W. B. Haines on Ionic Mobilities in Hydrogen and

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