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The Wars of Insects

The Struggle for Existence Involves Every Living Creature

By F. L. Bouvier

New “Total-Immersion” Hydrometer

The Dead Sea not Dead

The Physical Power of Women

Where Germany is obtaining Indispensable Supples

Scientific French, as it is Written

The Enclosed Observing Room

By Russell W. Porter

Malaria in Rumania

Human Aids to Machines

Man's Productive Capacity, Past and Present

By A. Russell Bond

Health of Hog versus Health of Man

The Energy Required to Produce Rain

By J. Patterson

Some Familiar Bird Friends

The Nuthatches and the Chickadees

By A. A. Allen

Evolution of Cable Making

The Cheese Mite

The Employment of Women in Munition Factories

By Miss O. E. Monkhouse

Merchant Ship Design and Torpedo Attack

War Aviation

Reviewing the Flying Experience of a British Expert

By B. C. Hucks

Operating Cost of Highways

By A. N. Johnson

Ferro-Concrete Ships—I

A Review of some of the Technical Features of Construction

By T. J. Gueritte

Quantity of Alcohol Obtainable from Various Materials

Acid Resisting Iron

Permanent Periodicity in Sun-Spots

War Work of a Contributor


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