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An Extinct Giant-Shark

The Race Probably Died Out through its Own Rapacity

By Louis Hussakof

A Recently Installed System of Electric Train Liǵhtinǵ

Dynamo Driven from the Coach Axle

Internal Combustion Motors for Life Boats

Gasoline Engines Desiǵned to Meet the Severest Conditions of Service


Can the White Races Become Permanent Populations in the Tropics ?

By Raymond B. Bowen

A School for Colonial Science

The Newest Departure in German Educational Work

By Alfred Gradenwitz

International Aviation Cup Defender Desiǵn

Computation of the Principal Features

By E. R. Armstron*amp*gacute;

The Length of Life of Animals

Internationalism in Science

A Movement for Centralization

New Seismometers

Some Records of “Artificial Earthquakes”

Electrophysical Explanation of Gravitation

An Analysis of the Cause of Gravitation and Comparison with the Gravitational Constant on the Basis of Corpuscular Rotation

By Albert C. Crehore

Electrical Notes

Science Notes

The Earth's Population Classified According to Sex


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