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Features

Safe Submarine Vessels and the Future of the Art

By Simon Lake

Washington's Great Concrete Bridge

By Frank N. Bauskett

The Treatment of Sewage

The Manufacture, Denaturing, and the Technical and Chemical Utilization of Alcohol.—II

By M. Klar

The Influence of Physical Conditions in the Genesis of Species

By Joel A. Allen

Improvement in Quadruplex Telegraphy

Electrically Operated Equatorial Mountings for Telescopes

A Method of Photometry of High Candle-Power Units

By T. B. Lambert

Linnæus

By Henry Kraemer

Means for Retarding the Setting of Plaster

A New Direct-Reading Wind Gage

By Alfred Gradenwitz

Progressiveness in Italy

Large Drainage Plant as Related to Mosquito Extermination

By Henry Clay Weeks

Electrical Notes

Trade Notes and Formulæ

Departments

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    May 18, 1907

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