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The Age and Area Law

A Fundamental Law of Geographical Distribution

By James Small

Mixtures of Alcohol with Various other Liquid Fuels

The Stone Age in America

Methods by Which the Indians made their Tools and Weapons

By A. F. Bonney

Nature of Heat as Directly Deducible from the Postulate of Carnot

Hydroelectric Development

Brewing Materials

Examination of Cocoa Powders for the Content of Husks

A Permanganate Electric Cell

By Arthur W. Warrington

The Breakdown of our Railway Transportation

Neglect of Motive Power Maintenance the Key to the Situation

The Nature and Treatment of Wound Shock

Gravitational Instability and Figure of the Earth

Problems of Atomic Structure—IV:

Differences Characteristic of Different Elements, and Mechanism of the Molecule

By J. J. Thomson

Engineering Feats of the Ancients

Properties of Portland Cement Having a High Magnesia Content

The Properties of Oils

And their Relation to Lubrication

By George B. Upton

The Geology of West Africa

With Notes on its Resources and Future Development

By R. Chudeau


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