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Features

The Boynton Unicycle Railroad

The Celebration of the Beginning of the Second Century of the American Patent System

Position of the Planets in April

Oriental Method of Vaulting

A Clasp for Connecting Timbers

A Spring Device for Singletrees

An Improved Cable Railway Crossing

A New Park for New York

A Fish Habitation

By Wm. P. Seal

Experiment in Specific Gravity of Fluids

Scientific American Building Edition- March 28, 1891

Advertisements

Experimental Science- March 28, 1891

By Geo. M. Hopkins

The Scientific American Publications for 1891

The Scientific American Established 1846- March 28, 1891

Departments

  • Letters

    To Inventors- March 28, 1891

  • Recommended

    New Books and Publications- March 28, 1891

  • List of Books

  • Departments

    Business and Personal- March 28, 1891

  • Notes & Queries- March 28, 1891

  • Recently Patented Inventions- March 28, 1891

  • Index of Inventions- March 28, 1891

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March 28, 1891

Beyond XX and XY

Biology. Identity. Equality.