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Some Alloys Suitable for Instrument Work—I

A Neglected Field for Investigation

By W. Rosenhain

Non-Inflammable Cinematograph Films

Proposed United States Aviation Field

Bill Before Congress for an Appropriation of $400,000

The northern Railway of Cameroon

A Difficult Task for the Engineer by the Berlin Correspondent of the Scientific American

The Reality of Molecules

A Resume of the Overwhelming Experimental Evidence Gathered Within the Past Decade

By T. Svedberg

The Educational Work of a Great Museum

What Are the Chief Functions of a Museum

By Harlan J. Smith

Mental Tests to Grade Pupils at School

In the Background of the Stars

Worlds in the Making

By C. A. Chant

The Autostable

A Flying Machine Possessing a High Degree of Automatic Stability

By W. I. Chambers

Our National Forests

Their Value, Management, and Needs

Power from Waste Fuel

Manufacturing the Circular Cut File

By Chester L. Lucas

Phosphorescent Plants

By F. Cavers

The Manufacture of Chemically Pure Acids

Some of the Problems Encountered

By J. T. Baker


[The editors me not responsible for statements made in the correspondence column. Anonymous communications cannot be considered, but the names of correspondents will be withheld when so desired.]..

Kitchen-Middens as Ethnological Records

By Harvey W. Shimer


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