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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.

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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

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

to the Sahara...

Mr. W. Topley on Upheaval and the Thickening of

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

NUMBER CCCXXIII.-FEBRUARY.

Mr. T. Davidson and Prof. W. King on the Trimerellida. 7
On the Permanent Ice in a Mine in the Rocky Mountains, by
R. Weiser

On the Conservation and the Properties of a Plate of Palladium

saturated with Hydrogen by Electrolysis, by R. Böttger

Prof. E. Bouty's Studies on Magnetism

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

Baillie Hamilton's String-Organ'.

Experimental Studies on the Electrical Resistance of Metals

and its Variation under the Influence of Temperature, by

M. René Benoit

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

Modern Spectroscope.

10

Dr. Attfield on the Spectrum of Carbon...

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

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

Sir James Cockle on Primary Forms

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

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

Proceedings of the Royal Society:—

Mr. R. Mallet on Volcanic Energy

Mr. W. Spottiswoode on Combination of Colour by means

of Polarized Light..

Prof. J. Tyndall on the Transmission of Sound

Proceedings of the Geological Society :-

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....

Mr. R. Etheridge on the Relationship existing between the

Echinothuridae and the Perischoechinidæ

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

the Boulder-clays of Cheshire

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

near the Wrekin in South Shropshire, with description

of a new Fauna...

On the Expression of the Work relative to an Elementary

Transformation, by J. Moutier

On the Analogies presented by the Liberation of Gases from

their Supersaturated Solutions and the Decomposition of

certain Explosive Bodies, by D. Gernez ..

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

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.)

Notices respecting New Books :→→

C. Ruchonnet's Exposition Géométrique des Propriétés

Générales des Courbes.

C. Ruchonnet's Éléments de Calcul Approximatif.

Lord Rayleigh on a Statical Theorem

Prof. E. Bouty's Studies on Magnetism

Mr. F. Guthrie on Salt Solutions and Attached Water. ... 206

Lord Rayleigh on General Theorems relating to Equilibrium

and Initial and Steady Motions

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CONTENTS OF VOL. XLIX.—FOURTH SERIES.

Proceedings of the Royal Society:-

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

and its conversion into the Aromatic Principle of

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

Page

Proceedings of the Geological Society :—

Principal Dawson on the Upper Coal-Formation of East-

ern Nova Scotia and Prince Edward Island in its rela-

tion to the Permian

Mr. J. G. Goodchild on the Carboniferous Conglomerates

of the eastern part of the Basin of the Eden... ... 238

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

North end of Driffield, East Yorkshire

Dr. O. Ward on Slickensides or Rock-striations, particu-
larly those of the Chalk

Mr. J. F. Campbell on Polar Glaciation.

Dr. F. Stoliczka on the occurrence of Jade in the Kara-

kash Valley, on the southern borders of Turkestan 240

Mr. F. G. H. Price on the Gault of Folkestone ..... 240

Mr. C. J. A. Meyer on the Cretaceous Rocks of Beer

Head and the adjacent Cliff-sections; and on the rela-

tive Horizons therein of the Warminster and Black-

down Fossiliferous deposits

Mr. H. G. Seeley on some of the Generic Modifications of

the Plesiosaurian Pectoral Girdle

Mr. H. G. Seeley on Muranosaurus Leedsii (Seeley), a

Plesiosaurian from the Oxford Clay.-Part I.

Mr. L. C. Miall on the remains of Labyrinthodonta from

the Keuper Sandstone of Warwick, preserved in the

On Magnetism, by A. Trêve

On a New Electromagnet, formed of Concentric Tubes of Iron

separated by Layers of Conducting Wire, by J. Camacho.. 244

On the Experimental Determination of Diamagnetism by its

Electrical Inductive Action, by Prof. A. Toepler, of Gratz. 246

NUMBER CCCXXV.-APRIL.

Mr. J. R. Capron on the Comparison of some Tube and other

Spectra with the Spectrum of the Aurora. (With Four

Mr. F. Guthrie on Salt Solutions and Attached Water

Dr. Attfield on the Spectrum of Carbon....

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

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

Sir James Cockle on Primary Forms

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

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

Proceedings of the Royal Society:-

Mr. R. Mallet on Volcanic Energy

Mr. W. Spottiswoode on Combination of Colour by means

of Polarized Light..

Prof. J. Tyndall on the Transmission of Sound

Proceedings of the Geological Society :-

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...

Mr. R. Etheridge on the Relationship existing between the

Echinothuridae and the Perischoechinidæ

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

the Boulder-clays of Cheshire

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

near the Wrekin in South Shropshire, with description

of a new Fauna.

On the Expression of the Work relative to an Elementary

Transformation, by J. Moutier

On the Analogies presented by the Liberation of Gases from

their Supersaturated Solutions and the Decomposition of

certain Explosive Bodies, by D. Gernez

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

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.) ..

Lord Rayleigh on a Statical Theorem

Prof. E. Bouty's Studies on Magnetism

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

Lord Rayleigh on General Theorems relating to Equilibrium

and Initial and Steady Motions

Notices respecting New Books :-

C. Ruchonnet's Exposition Géométrique des Propriétés

Générales des Courbes.

C. Ruchonnet's Éléments de Calcul Approximatif

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