Feature

Building up Machine Parts Can Save Much Metal for War

[Photograph]: How It Looks Inside

Front Matter

Absence of Uniforms Seen as Preventing Neuroses

Magnesium Extracted from Dolomitic Limestone

Vitamin May Be One Key to Diet-Cancer Problem

First Glances at New Books

Modified Blackouts Suggested by Electrical Engineer

Meningitis Epidemic Warning Issued in AMA-NRC Report

In Science Fields

Thumb-Tip Test Devised to Detect Nerve Injury

New Machines and Gadgets