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The upward Trend of Mortality in Middle Life and Old Age

A Danger Signal and its Meaning

By E. E. Rittenhouse

The Aeronautic Show at Olympia

Description of Some of the Principal Machines Exhibited

By Stanley Yale Beach

Continuous Rail for Chicago Street Traction

The Story of a Rush Order

Electrification of Benzene by Friction

The Bacteriology of Ice

The Danger of Infection from Natural Ice not Very Great

By Edwin O. Jordan

Peroxides and per-Salts—II

Their Preparation, Properties and Uses in the Arts and Industries

By A. S. Neumark

City Passenger Transportation in the United States

Report of an English Engineer

By George Duncan Snyder

Theory vs. Practice

The Frequency of Tubercular Infection

Gyroscopic Stabilizer for Ships

By Elmer A. Sperry

The Discovery of the Planet Neptune

Was It Chance or the Result of Scientific Plan?

By David Rines

A Strange Case of Abnormal Anatomy

Hygiene and Mortality


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March 29, 1913

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