Feature

Plan Large Scale Tests for Infantile Paralysis Immunity

Sixteenth U. S. Cyclotron for University of Illinois

[Photograph]: Armored Blitzkrieg

[Photograph]: Field Laboratory

Chemical Treatment of Glass Makes It More Transparent

Fourth Comet of the Year Is Found by Harvard Man

In Science Fields

“Whiskers” Made Visible on Micro-Organisms

Back Matter

Barro Colorado Island Now a Government Center

Warns U. S. Is in Danger of Invasion by Epidemics

Front Matter