Feature

New Model Curtiss Hawk Supplied to U. S. Army

Vitamin Linked with Sex; Found Associated with Ova

Two-Way Radio Sets Used to Tell Who Is “Killed”

In Science Fields

Disease without Remedy

Army Has Special Course in Tropical Medicine

Big Jump in Sleeping Sickness Reported from the Dakotas

Front Matter

Sun Is Bound to Explode, Turning Earth to Cloud of Gas

[Photograph]: Raid Warning by Radio

Lightness of Ammunition Factor in Choice of Gun

[Photograph]: Mass Production