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Features

The Green Leaf

Its Scientific and Economic Exploitation

The Scientific Basis of Rationing

Oil from Oil Shales

Electrolytic Recovery of Tin

Bulb Growing in the United States

A California Farm That Rivals the Best in Holland

By Arthur H. Dahl

Where our Birds Come from

By Lee S. Crandall

Paint for Iron

A Portable Street Flusher

Fish Isinglass and Fish Glue

Sources and Methods of Manufacture

By George F. White

German Cunning

Machine Guns for American Aircraft

Rescuing the Art Treasures of Venetia—II

From the Air Raids of the Austrians

By Arduino Colasantil

Changes in Oceanic and Atmospheric Temperatures

And their Relation to Changes in the Sun's Activity

By Fridtjof Nansen

The Slide Rule

The Aland1 Islands

The Sun's Equatorial Rotation

A Neglected Problem of Celestial Physics

By N. Johannsen

Russia's Industrial Losses

Super-Explosives

Electrolysis Mitigation—I

Discussion of Causes and Methods of Regulation

The Castor-Oil Plant

Shoes

Peat as a Fuel

Ant Pests and Ant-Eating Animals

Ironing Out Cracks in Iron

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    July 20, 1918

    Think Outside the Gift Box