Feature

America Builds Food Defense

Swine Erysipelas May Infect Human Beings

Challenge Price Boosts, Is Advice to Consumers

New Machine Gun Able to Change Rate while Firing

Critical Tests Made on Sulfapyridine for Cows

Nature Ramblings: Invisible but Important

Green Plants Give off Faint Red Radiation

First Glances at New Books

Front Matter

Five-Day Forecasts Launched by U. S. Weather Bureau

Very Essence of Life Is Absence of Repose

Predict Hitler’s Downfall When Sacrifices Seem Vain