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The Late Samuel Pierpont Langley

Gold and its Chemistry

By G. T. Beilby

Contemporary Electrical Science

Madame Curie's Recent Investigations of Polonium

Manufacture of Hydraulic Cements

By L. L. Stone

Note on Steam-Turbines

By H. Riall Sankey

Cement Mortar and Concrete: Their Preparation and use for Farm Purposes


By Philip L. Wormley

A New Gasoline Electric Railway Car

The Davy 336,000-Pound Rapid-Action Forging Press

The English Correspondent of Scientific American

Notes on Gutta Percha and Balata

By W. A. Caspari

Recent Processes Introduced in France for the Production of Starch

Hay Fever —A Newly-Discovered Remedy

A Convenient Camera

By George M. Hopkins

The Multifarious Varieties of Man

The Present Position of Radio-Activity

By Frederick Soddy

Ants that Weave with their own Larvæ

By Reh

Engineering Notes

Science Notes

Trade Notes and Formulæ


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