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Features

The Invasion of the Trenches by Rats—I

Its Causes and Its Remedies

Chloropicrin

By Orland Russell Sweeney

Gazebos

A Curious Feature of Ancient Architecture

By J. Tavenor Perry

Chemically Treated Fabrics for Powder Bags

Standardization of Freight Cars and Locomotives

Metals used in Aeroplane Construction

Their Composition and General Characteristics

By Walter J. May

A Simple Plan for Unifying Time in the United States

The use of Creosoted Fir for Marine Construction

By Bror L. Grondal

How Things Break—II

A Study of the Mechanism of Fractures in Materials

By Charles Freminville

Germans Learned Poison Gas Warfare from Savages

The Annealing of Glass

New Method of Treating Positive Electrodes of Primary Batteries

Paving Bricks from Blast-Furnace Slag

The Evolution and Destruction of Life

Effect of Modern Agencies on Wild Birds and Animals

By William Beebe

Quenching Large Forgings

Light Scattered by Dust-Free Air

Scent-Producing Organs of Insects

Oxyliquite

A Liquid Oxygen Explosive

A Test in Acclimatization

The Doppler Principle

High-Speed Internal-Combustion Engines

Features of Design and Principles of Operation

By Harry R. Ricardo

A New Waterproof Oil

Wireless Receiver in German Aircraft

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    October 26, 1918

    Think Outside the Gift Box