Feature

Adrenal Cortex May Help Body Resist Disease

Spring Begins Wednesday with Sun at Halfway Mark

Ambitious Woodpeckers Disrupt Electric Service

Science Seen as Aiding Totality of Human Advance

White Man Smokes Often, Red Man Smokes Hard

First Glances at New Books

Front Matter

Man-Made Radioactivity Achieved at Pasadena

Injections Lengthen Life of Tuberculous Rabbits

Plants Retain Heavy Water in Formation of Tissues

Lost History Sought in Mosque of St. Sophia

Winter Tornadoes Rare but Causes Are “Orthodox”