Feature

Dr. Elvehjem Wins Medal for Work in Nutrition

Device Saves Ammunition by Reducing Gun “Climb”

Survey of Physicians

Dr. Isaiah Bowman of Johns Hopkins Heads AAAS

Electronics Provided World with Ignition Rectifier

New Machines and Gadgets

Automobile Tires Built to Run without Tubes

First Glances at New Books

Front Matter

Immersion Foot Prevented

Gonorrhea and Chancroid Wiped out by Sulfa Pills

[Photograph]: Hovering