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Improved Boiler and Feed Water Heater

Rapid Transit in New York

A City One Hundred and Eighty Thousand Years Old

The Strength of Insects

Prospects of Science on the Pacific Slope

Dangers of Chloral Drinking

Collegiate Races


New Clinical Thermoscope

Improved Treadle Sawing Machine

Improved Air Reservoir

Device for Protecting Horses

Improved Slide Valve Calculator

Improved Milking Tubes

Cavender and Dallas' Corn Husking Implement

Alley's Bearing Feeler

Steller'a Blind Slat Holder

Smith's Improved Awl

The Cycads

The Ficaria

Scientific and Practical Information - July 31, 1875

The Jamin Magnet

Decisions of the Courts - July 31, 1875

Recent American and Foreign Patents - July 31, 1875

Canadian Patents - July 31, 1875

Communications Received - July 31, 1875


  • Letters

    Correspondence - July 31, 1875

  • Recommended

    New Books and Publications - July 31, 1875

  • Departments

    Notes and Queries - July 31, 1875

  • Business and Personal - July 31, 1875

  • Index of Inventions - July 31, 1875

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July 31, 1875

Confronting Common Wisdom