Feature

Postwar Wars

Industrial Research Has Grown Greatly in past Years

Nature Ramblings: More Hunting This Fall

Prime-Pairs Problem of Euclid Is Solved

Chemical Makes Lettuce Sprout in Hot Weather

Books off the Press

Glucosides Successfully Studied for First Time

New Hammer for Firearms Is Patented by Garand

New Machines and Gadgets

Front Matter

Gunsight for Planes

Flutter in Planes Recorded