Feature

“Grand-Scion” of Famous Elm to Replace Fallen Ancestor

Cost of Coal Is Reduced by Safety Measures in Mines

Foggiest Spot of U. S. A. Brightened up in 1930

Protective Foods: “A Classic of Science”

Front Matter

First Glances at New Books

Oil Pools Are Nurseries for Strange Species of Fly

Nature Ramblings: Spider Crabs

In Science Fields

Fleas Can Probably Transmit Typhus Fever, Scientists Say

New Scale Invented for Measuring Snow

Gulf Stream Writes Own Temperature Record