Feature

Seven Times Rebuilt Pyramid Explored at Tenayuca, Mexico

Jordan River, Ideal for Power, Is Made to Yield Electricity

Ship Uniformity Desired for Simplified Harbors

Elusive Aurora Is Duplicated in Evacuated Glass Tube

The Gastric Juice: “A Classic of Science”

Ice Hung in Baskets Melts More Slowly

In Science Fields

7,000,000 Acres of Locusts Hatching in East Africa

Front Matter

Nature Ramblings: American Eagles

New Moving Pictures in Colors Use Tiny Colored Squares

Pictures of Spinning Model Demonstrate Atom Structure