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The Rock City of Petra

By Franklin E. Hoskins

Bees and Flowers

Compression of Steel Ingots by Wire Drawing

How to Build a Hydroplane Gliding Boat

By William and Walter Stearns

Do Ants See?

Notes on Preparing Sodium Sulphite

By Randolph Bolling

The Dangers of Denatured Alcohol

Eating with our Eyes

By Day Allen Willey

Popular Errors Regarding Mushrooms

Graduated Curve for Drawing Symmetrical Lines

A Novel Lumbering Crane

By Henry Hale

The Problem of Television

A New Automobile Ambulance

Our English Correspondent

Artificial Fertilizers: Their Nature and Function—II

The supply of Nitrogen to the plant

By A. D. Hall

The Shape of Molecules

By W. F. Badgley

How to Build a 5-Horse-Power Stationary Gas Engine

By E. F. Lake

Some astronomical Paradoxes

By J. E. Gore

Engineering Notes

Science Notes

Trade Notes and Formulæ:


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