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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 cœlo,
Quo micet igne Iris, superos quis conciat orbes
Tam vario motu."

J. B. Pinelli ad Mazonium.

CONTENTS OF VOL. XLVII.

(FOURTH SERIES.)

NUMBER CCCIX.-JANUARY 1874.

Page

Mr. J. Y. Buchanan on an Apparatus for Gas-analysis.

(With a Plate.)

M. H. Herwig on the Disintegration of the Electrodes in the

Galvanic Arc of Light

Prof. Challis's Theory of the Source of Terrestrial Magnetism. 14

Mr. R. S. Brough on Wheatstone's Bridge..

Prof. Challis's further Discussion of the Analytical Principles
of Hydrodynamics, in Reply to Mr. Moon..

M. A. F. Sundell on the Electromotive and Thermoelectric

Forces of some Metallic Alloys in contact with Copper...

Mr. S. Roberts on a simple Condensing Collector for Fric-

tional Electrical Machines

Prof. W. F. Barrett on the Molecular Changes that accom-

pany the Magnetization of Iron, Nickel, and Cobalt

Notices respecting New Books:-

Mr. J. M. Wilson's Elementary Geometry.

Proceedings of the Royal Society:-

Dr. J. H. Gladstone and Mr. A. Tribe on an Air-Battery. 61

Mr. O. Reynolds on the Condensation of a Mixture of

Air and Steam upon Cold Surfaces

Proceedings of the Geological Society :-

Mr. S. Sharp on the Oolites of Northamptonshire.

On some Phenomena of Illumination, by A. Lallemand

On a Process for verifying the Nodes in a Sounding Pipe, by

NUMBER CCCX.—FEBRUARY.

Lord Rayleigh on the Manufacture and Theory of Diffraction-

Mr. O. Heaviside on Wheatstone's Bridge

Mr. J. Croll on the Physical Cause of Ocean-currents

Prof. W. H. Miller on Quartz, Ice, and Karstenite

Prof. E. C. Pickering's Measurements of the Polarization of

the Light reflected by the Sky and by one or more Plates of

Mr. R. Moon's Remarks on the Analytical Principles of Hy-

drodynamics, in Reply to Professor Challis

Dr. Helmholtz on Galvanic Polarization in Liquids free from

Notices respecting New Books:-

Mr. W. T. Pierce's Treatise on Practical Solid or Descrip-

tive Geometry: embracing Orthographic Projection and

Perspective or Radial Projection..

Prof. M. Yarnall's Catalogue of Stars observed at the

United States Naval Observatory during the years 1845

On a new Determination of the Mechanical Equivalent of Heat,

by H. Serrano y Fatigati...

On the Expansibility of Ebonite by Heat, by F. Kohlrausch.. 156

On the Discharge of Electrified Conductors, by J. Moutier.. 157

NUMBER CCCXI.-MARCH.

The Earl of Rosse on the Electric Resistance of Selenium .. 161

Mr. J. A. Phillips on the Composition of certain Mine Waters. 164

Mr. J. Croll on the Physical Cause of Ocean-currents. (With

M. H. Herwig on the Number and Weight of the Molecules

of Ether contained in Electric Conductors

Lord Rayleigh on the Manufacture and Theory of Diffraction-

M. J. L. Soret on some Phenomena of Polarization by Diffusion

M. A. Terquem on the Transformation of the Vibroscope into

a Tonometer, and its employment for the Determination of

the Absolute Number of Vibrations

Notices respecting New Books:-

The Rev. S. Hawtrey's Introduction to the Elements of

Proceedings of the Royal Society :-

Lieut. Sale on the Action of Light on the Electrical Re-

sistance of Selenium

Mr. D. M'Kichan's Determination of the Number of

Electrostatic Units in the Electromagnetic Unit ... 218

Messrs. Stewart and Tait on the Heating of a Disk by

rapid Rotation in vacuo.....

Mr. F. Chambers on the Diurnal Variations of the Wind

and Barometric Pressure at Bombay

Proceedings of the Geological Society:-

Dr. J. Bryce on the Jurassic Rocks of Skye and Raasay. 229

Mr. D. Mackintosh on the more remarkable Boulders of

the North-west of England and the Welsh Borders .. 230

Mr. T. Davidson on some Brachiopoda collected by Mr.

Judd from the Jurassic Deposits of the East Coast of

Prof. D. T. Ansted on Solfataras and deposits of Sulphur

Mr. J. Lucas on the Origin of Clay-Ironstone

Dr. Dawson on Leptophloum rhombicum and Lepidoden-

dron gaspianum..

Capt. F. W. Hutton on the younger formations of New

Mr. W. Carruthers on the Tree Ferns of the Coal-mea-

Mr. A. H. Schindler on the Geology of Kazirùn

The Rev. T. G. Bonney on the Lakes of the North-eastern

Signor B. Gastaldi on the Effects of Glacier-erosion in

On the Limits of the effective Power of Microscopes, by Pro-

fessor Helmholtz ...

Experimental Researches on Newton's Coloured Rings, by P.

On extraordinary developments of Light in the grinding of

hard Stones, by Dr. Jacob Nöggerath

Prof. J. P. Cooke on the Vermiculites; their Crystallographic

and Chemical Relations to the Micas; together with a dis-

cussion of the Cause of the Variation of the Optical Angle in

these Minerals (With a Plate.)

M. H. Vogel on the Sensibility to Light of Bromide of Silver

with respect to the so-called Chemically Inert Colours

Prof. Challis on the Effects produced by Fog and Vapour in

the Atmosphere on the Intensity of Sound

M. G. Lippmann on the Connexion between Capillary and

Electrical Phenomena. (With a Plate.)

Mr. R. Moon on the Measure of Work in the Theory of Energy. 291

M. F. Kohlrausch on the Determination of the Absolute Value

of the Siemens Mercury Unit of Electrical Resistance

Proceedings of the Royal Society:-

Sir B. C. Brodie on the Electric Decomposition of Car-

Messrs. Lockyer and Roberts on the Quantitative Ana-

lysis of certain Alloys by means of the Spectroscope.. 311

Mr. J. A. Broun on the Period of Hemispherical Excess

of Sun-spots, and the 26-day Period of Terrestrial

Proceedings of the Geological Society:-

Prof. E. Hull on the Permian Breccias and Boulder-beds

Mr. G. W. Stow's Geological Notes on Griqualand West. 313

Prof. T. R. Jones on some Bivalve Entomostraca, chiefly

Cypridinidæ, of the Carboniferous formations

On the Permanent Magnetism of Steel, by E. Bouty

Contribution to the Theory of the Magnetic Forces, by M. Stefan. 318

On a peculiar Occurrence of Crystallized Silicic Acid, by Theodor

On the Spectrum of the Light of Exploding Gun-cotton, by

Dr. J. H. v. Mädler

NUMBER CCCXIII.-MAY.

M. G. Quincke on the Determination of the prime Angle of

Incidence and prime Azimuth for the different Fraunhofer's

Mr. T. Muir on Sylvester's and other forms of continued

Fraction for Circle-quadrature.

Mr. J. Dewar on the Physical Constants of Hydrogenium

M. F. Kohlrausch on the Absolute Value of the Siemens

Mercury Unit of Electrical Resistance. (With a Plate.)

Direct Solution of a Geometrical Problem

Captain J. Herschel on a new form of Calendar, by which the

Year, or Month, or Month-day, or Week-day may be readily

found when the other three components of a date are given. 357

Dr. W. B. Carpenter on the Physical Cause of Ocean-currents. 359

M. F. Kohlrausch on a Variation-Barometer. (With a Plate.) 362

Notices respecting New Books:-

Prof. P. G. Tait's Elementary Treatise on Quaternions.. 364

Mr. T. Muir on the Expression of a Quadratic Surd as

a continued fraction

Mr. R. A. Proctor on the Universe and the Coming Tran-

Mr. C. C. Reeks's Elementary Astronomy

Proceedings of the Royal Institution :-

Professor Tyndall on the Acoustic Transparency and Opa-

city of the Atmosphere

Proceedings of the Royal Society:

Mr. J. N. Lockyer's Researches in Spectrum-Analysis in

connexion with the Spectrum of the Sun.-Part III... 384

Mr. J. Clerk Maxwell on Double Refraction in a Viscous

Fluid in motion

Calorific Effects of the Magnetism in an Electromagnet with

several Poles, by A. Cazin

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