Feature

Traffic Congestion Reduces Gasoline Mileage by Half

First Glances at New Books

German Artillery Has Few Surprises, Says U.S. Expert

Tear Gas Effective as Killer of Insect Pests

Nature Ramblings: Ecologist at Work

Oil Discoveries in Nebraska Based on Success in Michigan

First Glances at New Books

Front Matter

Colchicine Used on Rabbits to Double Chromosomes

Abscessed Teeth Treated with Hot Sulfanilamide

[Photograph]: A Magnet

Friendliness May Act to Spread Influenza