Feature

Helmets May Replace Caps for Sailors in Tropics

The Beagle Starts Her Voyage: “A Classic of Science”

Radio Waves Not Guilty of Upsetting Weather

Nature Ramblings: Christmas Trees

New Anesthetic Found in Accordance with Prediction

[Photograph]: Cosmic Rays Disrupt Atomic Hearts

Front Matter

Hydrogen Atoms of Twice Usual Weight Are Discovered

Boys Demonstrate Ability to See Things Hidden by Screen

Depression Does Not Justify Research Work Moratorium

Drawing Shows Man Rode Horse 5000 Years Ago

Wear on Tires Measured by Use of Depth Gages