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Improved Grain Hulling Machine, Applications of Vulcanized Rubber

Experiences of a Bureau Officer

The Application of Steam to Canals.--No. 5

By George Edward Harding

Phrenology and Spiritualism.--A Lively Discussion

Wood-Boring Beetles.--The "Girdlers"

By E. C. H. Day

Artificial Leech

Magrath's Chain for Hanging Sashes

Metallic Lined Spool Head

The Causes of Disease

Prejudices, Ancient and Modern

College Commencements

Ice a Necessity.--How It is Obtained in Quantity

Scientific Intelligence- July 15, 1871

Editorial Summary- July 15, 1871

Answers to Correspondents- July 15, 1871

Queries- July 15, 1871

Recent American and Foreign Patents- July 15, 1871

Official List of Patents- July 15, 1871

Practical Hints to Inventors- July 15, 1871

Applications for Extension of Patents- July 15, 1871


  • Letters

    Correspondence- July 15, 1871

  • Departments

    Business and Personal- July 15, 1871

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