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Features

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

By Chester L. Lucas

The Uranium and Radium Situation

A Great Opportunity for the United States

By Charles L. Parsons

Glimpses of the Moon

Signs of Volcanic Action and Vegetation

By Edward Vincent Heward

The United States Indian Census

Population

Evolution from the Standpoint of Physics—III

The Principle of the Persistence of Stable Forms

By Alfred J. Lotka

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

By D. A. Lyon

Some Mathematical Diversions

By F. B. Selkin

The Elimination of Smoke

By D. F. Crawford

Pocket Clothes Hanger

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  • Is our Civilization Dying?

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June 14, 1913

Beyond XX and XY

Biology. Identity. Equality.