Feature

Dinosaur Footprints Traced to Ancient Reptile Bones

Important Inventions Listed as Having Social Influence

New Radium Refining Plant to Be Started in Canada

America’s First Humans May Have Become Extinct

Experts on Indian Language Translate State Names

[Illustration]: How to Find New Comet

Harvard Astronomers Detect Cosmic Dust Cloud near Pole

Invisible Rays Help to Solve Molecule Structure Problems

Nature Ramblings: Bread Is Old

Traces of Aluminum Powder Prevent Dread Silicosis

Whales Immune to Dreaded Compressed Air Illness

Front Matter