Feature

Two Vanished Civilizations Found in South America

Cause of Pellagra Disease Is Not Yet Found

City 5,700 Years Old under “Oldest City”

Rapid Analysis of Steel Made from Its Waste

Air Mass Migrating at Time of Macon Disaster

C.C.C. Workers Prove Value of New Pneumonia Vaccine

X-Rays from Sun Found to Create Radio “Roofs”

Weather Not like That in Akron Disaster

Front Matter

Electronic Tides in Air Also Caused by Moon

Million Volt Generator for Atom Research

Abyssinia, Eyed by Italy, Reputed Source of Sheba Gold