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Features

The Formation of Leafmold

An Important Factor in the Production of Humus

By Frederick V. Colville

Unusual Roller Gaging Device

Cinematography Carried to Extremes in the Marey Institute

How to Tell Artificial Silks

The Double and Binary Stars

Over Ten Thousand Twin Stars Are Known

By F. W. Henkel

Device for Starting and Stopping Machine Tools

Sea and Air Command

Germany's New Policy in Its Relation to the British Naval Supremacy

The Photosynthesis of Nitrogen Compounds

Volume of Traffic and Density of Population

Against the Sun

Spiral Twists in Nature

By A. H. Kennedy

A New Law of Vulcanization

The Physical Chemistry of Rubber Manufacture

By Augustus O. Bourn

The Existence of an Ultra-Neptunian Planet

By Philip H. Ling

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June 21, 1913

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