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The Nashville Suspension Bridge

Editorial Correspondence

Science Familiarly Illustrated

Turning a Movable Wheel Around a Fixed Wheel

Manufacturing Mining and Railroad Items

Recent American and Foreign Patents

Answers to Correspondents

Harlan's Patent Animal Trap

Bruce's American Foot Stove

Making Chains Without Welding

The Commissioner of Patents

Consumption and Nature of Material Used in the Manufacture of Matches

Patent Bills before Congress

Hardening and Tempering Steel--The Value of Baths

Phosphorus--Its Characteristics

Badly Planned Buildings

Patents and Claims

Issued by the United States Patent Office

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February 29, 1868

Beyond XX and XY

Biology. Identity. Equality.