Feature

Vitamin C Is Suggested as Treatment for Pyorrhea

American Delegation Goes to World Documentation Meet

Front Matter

[Photograph]: Largest Chrome-Alum Crystal?

New Airplane De-Icers Approved by Air Commerce

Supposed “Ghost” Comet Claimed to Be Real

Core Samples of Sea Bottom Sought on Voyage of Atlantis

Chinese Civilization Is Not so Ancient as Once Thought

[Photograph]: Heavy Hydrogen “Factory”

Population Problems Call for a Government Policy

Scholars Form American Documentation Institute

Blue Grama Grass Can Now Be Seeded Cheaply