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Features

New Mode of Making Illuminating Gas from Light Hydrocarbon Oils

American Institute of Architects—Fireproof Construction

The Great Clock of Beauvais Cathedral and the Strasbourg Clock

On Rivets and Riveting

On the Temperature of Coal Mines

The Great Solar Eclipse

The Theory of Boiling—Tomlinson's Experiments and Conclusions

Artificial Blushes—How They are Produced

Effect of Form Upon Friction

Business Mistakes of Inventors

Portland Cement

Mechanical Fairs and Exhibitions

The Microscope in Silkworm Cultivation

The Properties of Resinous Timber

Coal—How it May and Must be Cheapened

Invention

Editorial Summary

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

Answers to Correspondents

Applications for Extension of Patents

Official List of Patents

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August 21, 1869

Beyond XX and XY

Biology. Identity. Equality.