Feature

Kennelly-Heaviside Ionized Layer: A Classic of Science

Crime Wave Spreads to Wild Animals

Adults Need Vitamin D

Nature Ramblings: White Pine

First Glances at New Books

Front Matter

Sub-Atomic Energy and “Science Sins”

Proof Protons Act like Waves Wins Physicist A. A. A. S. $1,000 Prize

Future of Teeth Predicted from Study of Past

Insane Not Likely to Have Families

Thomas H. Morgan Given New Honor

In Various Science Fields