Feature

Water, Seemingly Formless, Has Definite Structure

Volcanoes Are Great Miners; Bring Wealth from the Depths

Front Matter

High Purity Demanded of Cesium for Photocell Use

Planning Invention’s Future Seen as National Need

Consumer in Tough Spot between Bunk and Debunk

Oil’s Hidden Chemicals Rival Products from Coal

First Glances at New Books

DuPont Co. Establishes 24 Fellowships for 1938-9

Nature Changed the Rules Ten Billion Years Ago

Peruvian Mummies Come to New York

Spongy Iron Substituted for Lead Joint Packing