Feature

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

New Materials from Gas Used in Making Bomb

Nature Ramblings: The Lesser Pines

Fast Flight Problems

Books of the Week

Russia Firing Scientists Who Hold Banned Ideas

Use Garden Hose to Rid Trees of Ice

New Machines and Gadgets