Feature

[Photograph]: Camera Machine Gun

Upper Air Data Will Aid in Forecasting the Weather

In Science Fields

What Makes You Laugh

New Deadly Disease Is Destroying Elms in Ohio

Leading Scientists Are Born and Trained in East

Reversible Pitch Propeller to Be Tried as Brake

First Glances at New Books

Front Matter

Thrombin Treatment Promises to Save Lives of “Bleeders”

[Photograph]: New Wildlife Stamps

Time Important Factor in X-Ray Treatments