Feature

Museums Lack Specimens of Animals Now Becoming Extinct

First Glances at New Books

Front Matter

Man-Made Gamma Rays Six Times as Piercing as Nature’s

Electrical Device Aids in Measuring Speeds of Cars

Find New Way to Attack Disease of Muscle Weakness

Sound Recording Methods Preserve Bird Calls

[Photographs]: Fossil Tree’s Structure

Italy’s Chemists Gave Her Weapons for War in 1934

Mental Disorder Is Viewed as Disease of Old Age

New Instrument to Measure Light Intensity Developed

Spectroscope Proves Aid in Study of Hemoglobin