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Features

Motors in Agriculture

The London Correspondent of the Scientific American

The Mind of Primitive Man

By Franz Boas

The Chances for Young Men

On the Preservation of Unfermented Grape Juice

Fly-Wheel and Boiler Explosions Compared—Speeds for Cast-Iron Wheels

By William H. Boehm

Wolfgang Von Kempelen's Talking Machine

Improvements in Gas Engines

The New Observation Kites Invented S. F. Cody

A Personal Experience in Radiography, together with the Technique of Stereoscopic Radiography

By Alexander B. Johnson

Big Things of the West

By Charles F. Holder

Automatic Discharge of Ballast for Free Balloons

Causes of Ether Waves

Boomerangs

By Gilbert T. Walker

Recent Egyptian Archæological Work

The Lost Continent Story

Completion of the South African Survey

Trade Suggestions from United State Consuls

Trade Notes and Recipes

Patents!

Selected Formulæ

Departments

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    April 11, 1903

    Think Outside the Gift Box