Feature

Few Drops of Extract Gives Goiter to 200 Guinea Pigs

Muscular Physiology Studied by “Artificial Rainbow”

Yardstick Made for Volume of Sound

Most of Universe’s Radiant Energy in Cosmic Rays

New Mathematical Method Charts Course of Evolution

“Sky Rays” Range through Whole of Light Spectrum

First Glances at New Books

In Science Fields

Nature Ramblings: By Command of the Sun

Drinking Map of World Traced by Anthropologist

[Photograph]: Ark of the Covenant in Jewish Art

Modern Man May Be Old as Oldest of “Low-Brows”