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Features

The Contagion and Rapid Spread of Leprosy

Fires in Cotton Cargoes

Position of the Planets in October

The Frankfort Electrical Exhibition

A Simple form of Hat Holder

A Single Wheel Biding Machine

An Inexpensive Bow Bridge Sill

Opening of the St. Clair River Railway Tunnel Between the United States and Canada

The Locomotive Explosion at Oyster Bay, L. I.

Non-Venomous Snakes

By C. Few Seiss

One Kind of Cam

By A. D. Pentz

Departments

  • Letters

    Correspondence- September 26, 1891

  • Departments

    Recently Patented Inventions- September 26, 1891

  • Notes and Queries- September 26, 1891

  • Business and Personal- September 26, 1891

  • Index of Inventions- September 26, 1891

  • To Inventors- September 26, 1891

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September 26, 1891

Beyond XX and XY

Biology. Identity. Equality.