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Mining Gold by Proxy

The Old-Fashioned Miner Replaced by Machinery

By Arthur L. Dahl

Report on the Condition of Aeronautics in Germany

Extracts from a Report by the American Consul-General, Berlin, April 4th, 1913

The Increased Cost of Warships

Human and other Population of the United States

Floral Blue

By P. Q. Keegan

Pork Production

By J. I. Thompson

The Pendulum Propeller Rudder

An Oscillating Substitute for the Screw

By H. C. Vogt

High-Frequency Generator

For Wireless Telegraphy and Telephony

By E. F. W. Alexanderson

Classification of Igneous Rocks

By H. Warth

Rat-proof Buildings

The Lava Fountains of Kilauea

Observations by Telephotography

By Frank A. Perret

Propagation of High-Frequency Electric Waves along Wires—II

Advantages and Limitations of the System for Practical Operation

By John Stone Stone

A Convenient Method for Drawing Five- Centered Arches

By J. J. Klaber

Mind and Matter

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May 24, 1913

Think Outside the Gift Box