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Features

Testing Argentiferous Lead Ores

A New Telephone System

Vaccination in Smallpox

Rural Drainage and Disease

By H. C. Hovey

Agricultural Inventions

Feast of Strange Fish

By A. W. Roberts

Novel Rein Holder

Double Tongue for Harvesters

A New System of Telephony

By A. E. Dolbear

Silk Culture in America

Mechanical Inventions

Photographing the Vibrations of the Voice

By C. Cuttriss

Improved Wind Motor

Miscellaneous Inventions

Engineering Inventions

New Book Protector

Amphora of Bronze and White Metal

The Lump Fish

Departments

  • Departments

    Recent Inventions

  • New Inventions

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

  • New Books and Publications

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June 18, 1881

Beyond XX and XY

Beyond XX and XY

Biology. Identity. Equality.