Feature

Rocks Disclose Their Ages after Treatment with Acid

In Science Fields

[Photograph]: Like the Plan of a Modern City

Humor Saved Lincoln from Serious Mental Disease

Cost of Electricity Read Directly in Cents Per Hour

In Science Fields

Scientists Fortunate to Return from Region of Black Skies

Sea Salt Is Cause of Red Stain on Hides

Nature Ramblings: Catalpa Trees

Government Tests Show That Gasoline Dopes Are Useless

[Photograph]: Nature’s Own Skyscraper

Only One-Fourth of Hay Fever Patients May Expect Cure