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Features

Position of the Planets in September

John Ericsson

The New Patent Law of Mexico

The Photographers' Convention-A Memorial to Daguerre

An Improved Curtain-Pole Ring and Pin

An Improved Railroad Tie

An Improved Rein Grip

An Improved Shifting Eccentric

An Improved Folding Umbrella

An Improved Sled Propeller

The Census of the United States

Electrically Heated Sad Irons

A Bull with Two Mouths

Reproduction of an Old Pompeian Residence

Japanese Portiere or Curtain

Departments

  • Departments

    Business and Personal- August 30, 1890

  • Recently Patented Inventions- August 30, 1890

  • Notes and Queries- August 30, 1890

  • To Inventors- August 30, 1890

  • Index of Inventions- August 30, 1890

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August 30, 1890

Beyond XX and XY

Biology. Identity. Equality.