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SA Supplements Vol 55 Issue 1423supp

SA Supplements

Volume 55, Issue 1423supp

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Features

Motors in Agriculture

The London Correspondent of the Scientific American

The Mind of Primitive Man

Franz Boas

The Chances for Young Men

On the Preservation of Unfermented Grape Juice

Wolfgang Von Kempelen's Talking Machine

Improvements in Gas Engines

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

William H. Boehm

The New Observation Kites Invented S. F. Cody

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

Alexander B. Johnson

Big Things of the West

Charles F. Holder

Automatic Discharge of Ballast for Free Balloons

Causes of Ether Waves

Boomerangs

Gilbert T. Walker

The Lost Continent Story

Recent Egyptian Archæological Work

Trade Suggestions from United State Consuls

Trade Notes and Recipes

Completion of the South African Survey

Selected Formulæ

Patents!