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Features

Scientific Commission of Japan

History of Ice-Making Machinery

Condensed from the Milk Journal.

Soda

Extraordinary Experiments on Steam Boilers

Free Piston Air Pump

The American Historical Record

Preparation and Composition of Alloys

Knife Cleaner and Polisher

Mechanical Needle Sharpener

Haupt's Improved Easy Chair

The Late James Fisk, Jr.

Accurate Workmanship

High and Low Steam

Teach the Children to Draw

Pure Air

The Study of Botany

Scientific and Practical Information - January 20, 1872

Portable Fire Extinguisher

To City Subscribers - January 20, 1872

Recent American and Foreign Patents - January 20, 1872

Under this heading we shall publish weekly notes of some of the more prominent home and foreign patents.

Departments

  • From the Editor

    Answers to Correspondents - January 20, 1872

  • Letters

    Correspondence - January 20, 1872

  • Recommended

    New Books and Publications

  • Departments

    Business and Personal - January 20, 1872

  • Notes and Queries - January 20, 1872

  • Index of Inventions - January 20, 1872

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January 20, 1872

Beyond XX and XY

Biology. Identity. Equality.