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Canal of Isabella II, at Madrid

The “Dogwoods” Used in the Manufacture of Gunpowder in England

Condensed from a Paper in "The Student"

By John B. Jackson

The Tidal Wave

The Manufacture of Sulphuric Acid

Improvement in Frames for Spectacles and Eye Glasses

The Velocimeter–A New Aid in Mechanics

Aerial Navigation

Inflammable Gas-Engines

By F. A. P Barnard

Implement for Sharpening Knives

Boiler Explosions

Mica Brocades–a New Product of Art

What is to Become of Our Brown-Stone Fronts?

Is There Such a Thing as Social Science?

Polar Expeditions

The Care of House-Plants

H. S. Patent Office

Horsford's Phosphatic Bread

Editorial Summary

Answers to Correspondents

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

Official List of Patents

Issued by the United States Patent Office.


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