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Features

Acoustic Properties and Resonance of Buildings

An Excavator for Use on River Banks, Etc.

An Improved Car Fender

Swamp Music

The Harmless Smoker

"Dry Cell" Medical Batteries

Utilizing the Water Power of Niagara Falls

Decisions Relating to Patents

The Great Chicago Canal

The Metropolitan Club

The United States Ram Katahdin

The Training of Zebras

Communications Received

To Inventors - October 20, 1894

Departments

  • Recommended

    New Books and Publications - October 20, 1894

  • Departments

    Recently Patented Inventions - October 20, 1894

  • Notes and Queries - October 20, 1894

  • Business and Personal - October 20, 1894

  • Index of Inventions - October 20, 1894

  • Patents - October 20, 1894

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October 20, 1894

Beyond XX and XY

Biology. Identity. Equality.