Feature

Viruses Thought to Hold Secret of Life’s Origin

Miniature Hothouses Make Spring Vegetables Grow

First Glances at New Books

In Science Fields

Gold Rush Indians Now Dying out in Poverty

U. S. Patent System Spurs Enterprise of the Nation

Quakes Betray Big Guns

[Photograph]: Easter Sunday Disturbance

Front Matter

Scientists of All Americas to Meet in Washington

Bad Hearing, Sinus Pain from Imperfect Bite

New Apparatus May Double World’s Record High Pressure