Feature

Principles of Fog Formation Given Aeronautical Scientists

No Danger of Shortage in World’s Quinine Supply

New Color Process Takes Three Pictures on Two Films

Water Forms Compound with Stuff It Dissolves

First Glances at New Books

Front Matter

Defense Research Marks 1940

[Photograph]: Good Hunting

Science Is Mobilized for Defense of the Nation

[Photograph]: To Avoid Blackout

New Sulfa Drug May Save Patients Needing Operations

National Institute of Health Organizes Work on Chemicals