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Corrosion of Iron and Steel

Some Recent Discoveries in Astronomy

Various Directions in Which Important Progress Has Been Made

Gas Turbines brought to Practical Efficiency

The Formation of Primitive Oceans

The Ultramicroscope

And its Application to Modern Biology

Insects' Nests

Ingenious Methods of Construction and Curious Materials Employed

Living Magnets

Analogies Between Plants and Animals and Steel Magnets

Notes from a Volcano Laboratory

“Personal Documents” in the Case of Kilauea and Mauna Loa

By T. A. Jaggar

The German State Railroad Lines

A Most Important Factor in the German Campaigns By Frederick William Wile

By Frederick William Wile

Investigating Radium Ores in Canada

The Efficiency of Explosives

Man's True Thermal Environment

Signaling on Railway Trains in Motion—I

Various Systems of Engine Cab Signals Used in France

Geographic Aspects of the War—II

How Topographical Conditions Affect Military Operations

By Douglas Wilson Johnson

Economizing Zinc

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    October 02, 1915

    Think Outside the Gift Box