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THE

LONDON, EDINBURGH, AND DUBLIN

PHILOSOPHICAL

PHILOSOPHICAL MAGAZINE

AND

JOURNAL OF SCIENCE.

CONDUCTED BY

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. LIPS. Polit. lib. i. cap. 1. Not.

VOL. XXIX.-SIXTH SERIES.
JANUARY-JUNE 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 quæstionem, quæstio investigationem, investigatio inventionem."-Hugo de S. Victore.

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CONTENTS OF VOL. XXIX.

(SIXTH SERIES).

NUMBER CLXIX.-JANUARY 1915.

Page

Prof. E. Taylor Jones on the most Effective Adjustment of

an Induction-coil. (Plate I.) ...

Mr. C. V. Raman on Motion in a Periodic Field of Force.

(Plate II.).....

Messrs. W. J. Jones and J. R. Partington on the Ideal

Refractivities of Gases

Messrs. W. J. Jones and J. R. Partington on a Theory of

Supersaturation

Dr. H. Stanley Allen on the Magnetic Field of an Atom in

Relation to Theories of Spectral Series .

Prof. G. A. Schott on the Motion of the Lorentz Electron.

Dr. I. J. Schwatt: Note on the separation of a Fraction into

Partial Fractions..

Dr. I. J. Schwatt: Note on the Expansion of a Function..

Mr. R. V. Southwell on the Collapse of Tubes by External

Dr. A. D. Fokker: A Summary of Einstein and Grossmann's

Theory of Gravitation....

Mr. A. É. Young on the Form of a Suspended Wire or Tape

including the Effect of Stiffness..

Dr. F. A. Lindemann on the Theory of the Metallic

Dr. H. Stanley Allen on the Series Spectrum of Hydrogen

and the Structure of the Atom ...

Prof. A. W. Porter on the Variation of the Triple-Point of a

Substance with Hydrostatic Pressure

Mr. J. Rice on the Form of a Liquid Drop suspended in

another Liquid, whose density is variable.

Dr. Emil Paulson on the Spectrum of Palladium

Mr. G. H. Livens on Lorentz's Theory of Long Wave

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

duction.-I. ....

Mr. F. Lloyd Hopwood on the Plastic Bending of Metals.. 184

Dr. S. A. Shorter on the Shape of small Drops of Liquid.. 190

Mr. N. P. K. J. O'N. McCleland: A Study of the Absorp-

tion Spectra of Organic Substances in the Light of the

Electron Theory

Notices respecting New Books:-

Dr. J. R. Kippax's The Call of the Stars

Proceedings of the Geological Society :-

Dr. A. Dunlop on a Raised Beach on the Southern Coast

Prof. S. J. Shand on Tachylyte Veins and Assimilation

Phenomena in the Granite of Parijs (Orange Free

Intelligence and Miscellaneous Articles :-

Pressure of Radiation on a Receding Reflector: Corri-

genda, by Sir J. Larmor

NUMBER CLXX.-FEBRUARY.

Lord Rayleigh on some Problems concerning the Mutual

Influence of Resonators exposed to Primary Plane Waves. 209

Prof. E. C. C. Baly on Light Absorption and Fluorescence.-

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

Effect in Satellites of the Violet Line (4359) of Mercury.

(Plates III. & IV.)

Mr. H. P. Walmsley and Dr. W. Makower on the Magnetic

Deflexion of the Recoil Stream from Radium A. (Plate V.

Mr. N. Tunstall and Dr. W. Makower on the Velocity of

the a Particles from Radium A. (Plate V. fig. 2.) ...... 259

Mr. W. Morris Jones: Frictional Electricity on Insulators

Lord Rayleigh on the Widening of Spectrum Lines

Mr. E. J. Evans on the Spectra of Helium and Hydrogen.

(Plate VI.) ....

Profs. P. Ehrenfest and H. Kamerlingh Onnes on a Simplified

Deduction of the Formula from the Theory of Combinations

which Planck uses as the Basis of his Radiation Theory.. 297

Mr. P. G. Nutting on the Visibility of Radiation

Dr. A. C. Crehore on the Gyroscopic Theory of Atoms and

Dr. N. Bohr on the Series Spectrum of Hydrogen and the

Structure of the Atom....

Notices respecting New Books :—

Dr. L. Silberstein's The Theory of Relativity

NUMBER CLXXI.-MARCH.

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

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

gating Thermionic Emission

Dr. Norman Campbell on the Ionization of Metals by Cathode

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

Newtonian Mechanics.

Dr. Genevieve V. Morrow on Displacements in certain

Spectral Lines of Zinc and Titanium . . . .

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

Wave-lengths and their Absorption Coefficients

Mr. H. Pealing on Condensation Nuclei produced by the

Action of Light on Iodine Vapour

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-

Notices respecting New Books :--

Mr. Heyward Scudder's The Electrical Conductivity and

Ionization Constants of Organic Compounds

NUMBER CLXXII.-APRIL.

Lord Rayleigh on Eoliau Tones

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

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

of a Viscous Fluid ..

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

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

Earth's Crust ...

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

Harmonograph. (Plate VIII.)

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

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

Viscous Fluid. (Plate IX.)..

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

Prof. Louis Vessot King on the Precision Measurement of

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

meter. (Plate X.)

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