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Tungsten Lamps of High Efficiency—II

Nitrogen-Filled Lamps

By Irving Langmuir and J. A. Orange

Fleas can Transmit Infectious Diseases

The New Berlin Aquarium

The Old Establishment Resuscitated on a New Site

By Alfred Gradenwitz

The Evolution of the Modern Stereoscope

Many Forms of the Instrument have been Devised

By A. Lockett

The Puma-Jaguar Controversy

The Problem of the Geographical Distribution of Two Species

By Lincoln Wilbar

Area of Earth's Surface Visible at any Altitude

Road Models of the Office of Public Roads

From Roman Times to the Present Day

Industrial Research in America

Some Examples of the Harvests Gathered in

By A. D. Little

Variability of Nebulae

Two Unsolved Problems of Astronomy

Planetary Pertubations and the Moon's Motion

By Arthur B. Turner

The Nieuport Monoplane

A Machine whose Success Depends on its Wing Section

By John Jay Ide

Scientific Management

The Present State of the Art

The Camphor Industry in Formosa

An Important Japanese Monopoly


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