Feature

Evolution of the Heavy Diesel Engine

Riots to Understand Einstein Theory

Ozone Useless for T. B.

First Glances at New Books

Front Matter

Electron Bullets Deadly to Germs

Film Phonograph Plays for 2 Hours

If America Had Not Been Discovered

The Telephone: A Classic Invention

In Various Science Fields

Ancient Myth Had Basis in Fact

Signs of Culture Found in Rubbish