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Features

Machine for Rifling Gun Barrels

Influence of Food Upon the Intellect

Miscellaneous Summary

Hard Boiling

The Great Naval Controversy

American Armor Plates

The Camphor Storm-Glass

The World's Indebtedness to Science

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Recent Southern Intelligence

Comparison Between American and English Taxes

Patent Claims

Recent American Patent

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Patents Granted for Seventeen Years!

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February 20, 1864

Beyond XX and XY

Biology. Identity. Equality.