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The Work of General Gallieni in Madagascar

Naval Architecture

By Vernon D. Cox

Rosa Bonheur

Two Centuries of Tea

A Few Spiders and their Spinning Work

Gems of Maine

Trade Suggestions from United States Consuls

Miscellaneous Notes

Electrical Notes

Engineering Notes

The New Daimler Motor-Carriage

Express Passenger Locomotive for the French State Railways

The Nordenfelt Rapid Fire Campaign Gun

The Problem of Electrolysis

Sanitary Lessons of the War

By George M. Sternberg

Why do the Dials of our Timepieces have Twelve Divisions?

The Diffraction Process of Color Photography

By R. W. Wood

Frozen Food

By Leonard W. Lillingston

A Simple Exerciser

Perfume Plants

Patents!

Departments

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    July 08, 1899

    Beyond XX and XY

    Biology. Identity. Equality.