Feature

Nature Ramblings: Friends or Foes?

First Glances at New Books

Front Matter

Traces of Aluminum Powder Prevent Dread Silicosis

[Photograph]: One in Five Million

Invisible Rays Help to Solve Molecule Structure Problems

[Illustration]: How to Find New Comet

America’s First Humans May Have Become Extinct

Pharaohs in Museums Not True to Life

Dinosaur Footprints Traced to Ancient Reptile Bones

Insects Were Giants When Coal Was in the Making

New Radium Refining Plant to Be Started in Canada