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

J. B. Pinelli ad Mazonium.

[graphic][subsumed][subsumed]

CONTENTS OF VOL. XXXIX.

NUMBER CCXLI.-JUNE.

Page

Prof. A. Schuster on the Scale-Value of the late Dr. Joule's

Thermometers. (Plates V. & VI.)...

477

Dr. Ladislas Natanson on the Kinetic Energy of the Motion

of Heat and the corresponding Dissipation Function .... 501

Mr. Spencer Umfreville Pickering on the Heat of Combination

of Substances in the Liquid and Solid Condition

· 510

Dr. F. Richarz on Helmholtz's Electrochemical Theory, and

some Conclusions deduced from the same

529

Mr. G. H.. Bryan on a Simple Graphic Illustration of the

Determinantal Relation of Dynamics

531

Prof. Silvanus P. Thompson on a Neglected Experiment of

Ampère...

534

Proceedings of the Geological Society :

Mr. John H. Cooke on the Pleistocene Beds of the

Maltese Islands

542

Rev. R. Baron’s Geological Notes of a Journey in Mada-

542

Mr. R. Bullen Newton on a Collection of Fossils from

Madagascar obtained by the Rev. R. Baron

513

Prof. T. G. Bonney's Supplementary Note on the Nar-

borough district (Leicestershire).

543

Mr. J. E. Marr on the Tarns of Lakeland

544

Mr. J. Bridges Lee's Description of a New Instrument

for Surveying by the Aid of Photography, with some

Observations

upon the Applicability of the Instrument

to Geological Purposes.

544

Mr. David Draper on the Marble Beds of Natal

545

Mr. Thomas Leighton on the Lower Greensand above

the Atherfield Clay of East Surrey.

546

Mr. W. S. Gresley on the Eastern Liinits of the York-

shire and Derbyshire or Midland Coalfield...

547

Mr. W. S. Gresley on some Phases of the Structure and

Peculiarities of the Iron Ores of the Lake Superior

Region ...

547

On Electromagnetic Tractive Force, by M. Weber

547

On the Influence of Magnetization on the Constants of Elas-

ticity in Iron, by A. Bock

548

On the Magnetization of Iron by very small Forces, by

Werner Schmidt

548

Index

549

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