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Motion Pictures in Colors

Various Methods by which the Problem has been Attempted

Circumventing Niagara Falls

A New Welland Canal Necessitated by Increasing Traffic

By Bernard Farrows

Producing Steel Direct from the Ore

The Cockerill Iron Works

One of the Famous Manufactories of Belgium by our Paris Correspondent

Good Roads and the Government

Marketing our Food Products

Detecting Polarity of Electric Circuits

Training Elephants in the Belgian Congo

Testing High Tension Insulators for Leaks

The Psychanalytic Movement—I

Its Services in the Prevention of Insanity

By James J. Putnam

Why Rivers Overflow

How Floods May Be Prevented

By Arthur E. Morgan

Development of Return-Tubular Boiler Furnace

By Osborn Monnett

Dual Aeronautical Motors

Artificial Daylight—I

Light Sources Suitable for Color—Matching

By Herbert E. Ives

The Safe use of Electricity in Coal Mining

Conditions Under which Explosions of Gases and Dust May Result from Sparks

By W. M. Thornton


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