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Features

Improved Elevator for Mines

The Worcester Mechanics' Fair

West Albany Locomotive Works

Miscellaneous Summary

Manufactures in Hartford

The Arabic Numerals Representative, and not Arbitrary Characters

Polytechnic Association of the American Institute

Special Notices

New Publications

The Markets

Cleanliness of Tools

Russ's Patent Knife and Scissors Sharpener

Vulnerability of Iron-Clads--The Shoe-Buryness Experiments

The Combustion of Coal--Economy in Fuel

Machinery Versus Manipulation

Patent Claims

Allen's Weeding or Scuffle Hoe

Gschwind and Grether's Combination Hook and Holder

Departments

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    Correspondence

  • Notes and Queries

  • New Inventions

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October 20, 1866

Beyond XX and XY

Biology. Identity. Equality.