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THE

LONDON, EDINBURGH, AND DUBLIN

PHILOSOPHICAL MAGAZINE

AND

JOURNAL OF SCIENCE.

CONDUCTED BY

LORD KELVIN, LL.D. P.R.S. &c.
GEORGE FRANCIS FITZGERALD, M.A. Sc.D. F.R.S.

AND

WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.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. XXXVIII.--FIFTH SERIES.

JULY DECEMBER 1894.

LONDON:

TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET.

SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD.; WHITTAKER AND CO.;

AND BY ADAM AND CHARLES BLACK;—T. AND T. CLARK, EDINBURGH ;
SMITH AND SON, GLASGOW;--HODGES, FIGGIS, AND CO., DUBLIN ;-
PUTNAM, NEW YORK.;-- VEUVE J. BOYVEAU, PARIS ;-

AND ASHER AND CO., BERLIN.

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

-“Cur spirent venti, cur terra dehiscat,
Cur mare turgescat, pelago cur tantus amaror,
Cur caput obscura Phoebus ferrugine condat,
Quid toties diros cogat flagrare cometas,
Quid pariat nubes, veniant cur fulmina coelo,
Quo micet igne Iris, superos quis conciat orbes
Tam vario motu.”

J. B. Pinelli ad Mizonium.

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CONTENTS OF VOL. XXXVIII.

NUMBER CCXXX.-JULY 1894.

Page

Mr. W. Sutherland on the Attraction of Unlike Molecules.

I. The Diffusion of Gases

1

Mr. Carl Barus on Coloured Cloudy Condensation, as Depend-

ing on the Temperature and the Dust-contents of the Air.

(Plate V.)

19

Dr. W. Peddie on Torsional Oscillations of Wires.

36

Dr. Charles V. Burton on the Mechanism of Electrical Con-

duction.—Part I. Conduction in Metals

Mr. W. B. Croft: Some Observations on Diffraction. (Plates
I-IV.)

70

Dr. L. Bleekrode on some Experiments with Carbon Dioxide

in the Solid State

81

Prof. R. Threlfall on an Approximate Method of finding the

Forces acting in Magnetic Circuits

89

Prof. O. Henrici on a New Harmonic Analyser

110

Mr. Archibald Sharp on an Harmonic Analyser, giving

Direct Readings of the Amplitude and Epoch of the various

constituent Simple Harmonic Terms

121

Prof. Perry: Remarks on Prof. Henrici's Paper on a new

Harmonic Analyser

125

Rev. O. Fisher on the Effect of Sphericity in Calculating the

Position of a Level of no Strain within a Solid Earth, and

on the Contraction Theory of Mountains

131

Mr. F. L. O. Wadsworth on an Improved Form of Littrow

Spectroscope. (Plate VI.)

137

Dr. Alexander Macfarlane on the Geometrical Interpretation

of log U9

143

Dr. John Kerr on a Fundamental Question in Electro-Optics. 144

Notices respecting New Books :-

Mr. 0. Heaviside's Electromagnetic Theory

146

Proceedings of the Geological Society :-

Mr. J. Parkinson on Leigh Creek Jurassic Coal-Measures

of South Australia ; and on the Physical and Chemical

Geology of the Interior of Australia

157

On the Dependence of the Photoelectric Current on the

Position of the Plane of Polarization of the Exciting Light

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