Feature

Front Matter

Sex Control Succeeds with Warm-Blooded Animals

[Photograph]: Spider of Steel

Find Second Way of Making Radioactive Nitrogen

New World Record Found for Height of Daily Tide

Infantile Paralysis Vaccine Being Tried in New York

Mild Winter and Drought Menace Park Animals’ Range

Jupiter and Saturn Have Atmosphere of Deadly Gas

[Photograph]: In a Museum Now

Many More Gland Secretions Still Awaiting Discovery

Two Earthquakes Shock Mexico and Chile

Pressing Problems of Science Listed by SAB Chairman