Feature

Voluntary Health Plans

Books of the Week

Magnetic Fluid Clutch

U. S. Influenza Vaccine Can Fight Type in Europe

New Machines and Gadgets

Stumps Yield Chemical Wealth

Better Coal Use Expected

Mock-Ups of Planes Used to Train Pilots

Tube Tests Effects of Supersonic Speeds on Planes

Insect Fifth Column

Alaska Needs Waterpower

[Photograph]: Results of Sabotage