Feature

A Lady Who Keeps No Secrets

In Science Fields

The Mechanical Equivalent of Heat: “A Classic of Science”

Motion Pictures Made of Growing Nerve Fibers

First Step Taken toward Synthetic Sex Hormone

Nature Ramblings: Clothes Moth

Nature Ramblings: An Ancient Aristocracy

Rabbit and Rat Embryos Are Grown in Laboratory

Babies behind Glass Plate Tested to Learn Behavior

First Glances at New Books

Front Matter

Waste of Metals, Coal and Oil May Starve Machine Age