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Features

Perpetual Motion

The One Phenomenon Which Is Universal and Constant

By Charles E. Benham

Concrete Purifiers

X-Ray Pictures of Living Plants

A Valuable Method to Assist the Botanist in Studying Vital Processes

A 15,000 Horse Power Vertical Turbine

Golfer's Foot

An Improved Dry Cell Battery

By H. R. Palmer

The Elements

What They Are; Their Fundamental Attributes, and the Atomic Theory

By Theodore W. Richards

Genesis and Absorption of X-Rays

By J. J. Thomson

Pioneer British Electric Freight Railway

The Dordogne

The Primitive European's Cradle

By Joseph de Sury

The Naval Battle of the Skagerrak

How the Engagement Is Viewed in Germany

By Z. S. Hollweg

Sound Propagating and Zones of Silence

The Iron-Bacteria—II

A Curious Class of Organisms, Their Physiology, and Their Action on Iron Solutions

By David Ellis

Timbers of the Philippines

Many Woods of Value for a Great Variety of Purposes

Photographic Enlargements

The Importance of the Care of the Teeth

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    August 26, 1916

    Think Outside the Gift Box