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Features

The Sponge Fisheries of the Bahamas

By J. F. Coonley

Economy of Flight

A Portable Hot Water or Steam Heater

A Wagon Maker's Spoke Puller

An Electric Lamp Cover and Switch

A Continuous Driving Ratchet Drill

A Design for Easels and Other Stands

An Improved Typewriting Machine

An Improved Churn

The World's Fair Lumber and Forestry Building

A Steam Engine Slide Valve

Largest Dry Dock on the Great Lakes

Some Suggestions in Photography

By M. Hopkins

Departments

  • Letters

    Correspondence- November 21, 1891

  • Recommended

    New Books and Publications- November 21, 1891

  • Departments

    Business and Personal- November 21, 1891

  • Notes and Queries- November 21, 1891

  • Recently Patented Inventions- November 21, 1891

  • To Inventors- November 21, 1891

  • Index of Inventions- November 21, 1891

  • Patents- November 21, 1891

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November 21, 1891

Beyond XX and XY

Beyond XX and XY

Biology. Identity. Equality.