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Features

Improved Beater Hay Press, Steel in English Iron-clads, and more

Miscellaneous Summary

Powder

Introduction of the Porcelain Manufacture

Recent American Patents

Special Notice

A New Scientific Society

Improvement in Photography

The Attempt to Burn the City

The Scientific American For the Ensuing Year

What Can be Done for Inventors--Advice Gratis and Advice for Pay

Death of Professor Silliman

Oil Cups

Patent Claims

Markets for the Month

Farmers' Club

Kimball's Watch Movement Holder

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    New Books and Publications

  • Correspondence

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  • Notes and Queries

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December 10, 1864

Beyond XX and XY

Biology. Identity. Equality.