The Chemical Industries of Germany—II

An Historical Review of Processes and Conditions

Purchasing Coal on Heat Unit Basis

Forging Shrapnel Shells

Some Details of Modern Methods Now in Use

Plating by Impact

Death of Pierre-Emile Martin

The Largest American Gas Engine

Light-Stroke

The Art of Mobile Color

And a Discussion of the Relation of Color to Sound

Radium Treatment of Cancer

Floor Surfaces in Fireproof Buildings

Recommendations in Regard to Material and Methods of Construction

High-Speed Engines

Railway Rail Production and Failures

Automobile Lubrication—II

How to Test, and How to Use Various Classes of Oils and Greases

Porous Boiler Settings

Measuring Growth of a State

First Enumeration Solely to Provide for Political Reapportionment

The Scientific American Supplement Index for Vol. 79