Philosophical Magazine

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. XLIX.

(FOURTH SERIES.)

NUMBER CCCXXII.-JANUARY 1875.

Mr. F. Guthrie on Salt Solutions and Attached Water

Dr. E. J. Mills on Aniline Derivatives

Mr. P. Smyth on Carbon and Hydrocarbon in the Modern Spec-

troscope. (With Two Plates.)

Mr. F. Galton on Statistics by Intercomparison, with Remarks

on the Law of Frequency of Error

Prof. A. M. Mayer on a new Method of investigating the

Composite Nature of the Electric Discharge

M. J.-L. Soret on Polarization by Diffusion of Light

Prof. A. S. Herschel on the Spectrum of the Aurora

Notices respecting New Books:-

Dr. W. Spottiswoode on the Polarization of Light

Proceedings of the Geological Society:-

....

Prof. A. C. Ramsay on the Physical History of the Valley

of the Rhine'.

Mr. W. Topley on Upheaval and the Thickening of

Subjacent Beds

Mr. G. Maw's Geological Notes on a Journey from Algiers

to the Sahara...

Mr. T. Davidson and Prof. W. King on the Trimerellidæ. 76

On the Permanent Ice in a Mine in the Rocky Mountains, by

R. Weiser

On the Mixture of Colours in Binocular Vision, by W.

Bezold

von

Experimental Studies on the Electrical Resistance of Metals

and its Variation under the Influence of Temperature, by

M. René Benoit

On the Conservation and the Properties of a Plate of Palladium

saturated with Hydrogen by Electrolysis, by R. Böttger .. 80

NUMBER CCCXXIII.-FEBRUARY.

Prof. E. Bouty's Studies on Magnetism

Mr. R. H. M. Bosanquet on the Mathematical Theory of Mr.

Baillie Hamilton's String-Organ'.....

Dr. W. Marshall Watts on Carbon and Hydrocarbon in the

Modern Spectroscope.

104

Page

Dr. Attfield on the Spectrum of Carbon..

106

Mr. L. Schwendler on the General Theory of Duplex Tele-

graphy

108

Prof. O. Silvestri on the Eruption of Etna on the 29th of

August, 1874

126

Sir James Cockle on Primary Forms

134

Prof. J. C. Draper on the Projection of the Fraunhofer Lines

of Diffraction and Prismatic Spectra on a Screen....

Proceedings of the Royal Society:-

142

Mr. R. Mallet on Volcanic Energy

144

Mr. W. Spottiswoode on Combination of Colour by means

of Polarized Light..

146

Prof. J. Tyndall on the Transmission of Sound

Proceedings of the Geological Society:-

151

Colonel C. W. Jenks on the Occurrence of Sapphires and

Rubies in situ with Corundum, at the Culsagee Corun-

dum Mines, Macon Co., North Carolina..

152

Mr. R. Etheridge on the Relationship existing between the

Echinothuride and the Perischoechinidæ

152

Mr. W. SHONE on the Discovery of Foraminifera &c. in

the Boulder-clays of Cheshire

153

Mr. C. Callaway on the Occurrence of a Tremadoc Area

near the Wrekin in South Shropshire, with description

of a new Fauna..

153

On the Expression of the Work relative to an Elementary

Transformation, by J. Moutier

154

On the Analogies presented by the Liberation of Gases from

their Supersaturated Solutions and the Decomposition of

certain Explosive Bodies, by D. Gernez.

157

On Venus as a Luminous Ring, by Prof. C. S. Lyman

159

NUMBER CCCXXIV. -MARCH.

Dr. H. F. Weber on the Specific Heat of the Elements Carbon,

Boron, and Silicon.-Part I. The Relation between the Spe-

cific Heat of these Elements in the free state and the Tem-

perature. (With a Plate.) .

161

Lord Rayleigh on a Statical Theorem

183

Prof. E. Bouty's Studies on Magnetism

186

Mr. F. Guthrie on Salt Solutions and Attached Water.

Lord Rayleigh on General Theorems relating to Equilibrium

and Initial and Steady Motions

206

218

Notices respecting New Books :→→→

C. Ruchonnet's Exposition Géométrique des Propriétés

Générales des Courbes....

225

C. Ruchonnet's Éléments de Calcul Approximatif.

227

Proceedings of the Royal Society:-

Messrs. F. Tiemann and Ŵ. Haarmann on Coniferine,

and its conversion into the Aromatic Principle of

Vanilla

Page

229

Mr. R. Mallet on the alleged Expansion in Volume of

various Substances in passing by Refrigeration from

the state of Liquid Fusion to that of Solidification .. 231

Mr. J. N. Lockyer on the Absorption of great Thick-
nesses of Metallic and Metalloidal Vapours ..
Mr. J. N. Lockyer on the Evidence of Variation in Mo-
lecular Structure

Proceedings of the Geological Society:-

Principal Dawson on the Upper Coal-Formation of East-

ern Nova Scotia and Prince Edward Island in its rela-

Mr. J. G. Goodchild on the Carboniferous Conglomerates

of the eastern part of the Basin of the Eden ....

Mr. R. Mortimer on a Well-section in the Chalk at the

North end of Driffield, East Yorkshire

238