A Fabric Impermeable to X-rays

A Tragedy of the Air

Five French Army Officers Killed in a Balloon Ascent

Making Steel Type

Cutting Letters in Steel by Hand and Machine

The Uranium and Radium Situation

A Great Opportunity for the United States

Glimpses of the Moon

Signs of Volcanic Action and Vegetation

The United States Indian Census

Population

Evolution from the Standpoint of Physics—III

The Principle of the Persistence of Stable Forms

Ugly Fishes

Freaks of Nature in Marine Life

The Electric Furnace in the Production of Iron from Ore

A Critical Discussion and a Comparison of Scandinavian and Californian Practices

Some Mathematical Diversions

The Elimination of Smoke

Pocket Clothes Hanger