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Features

Improvement in Oscillating Engines

Tooth Powders

Mine of Alum

List of Patent Claims

The New Law of Patents

Test for Mercury

The Proposed Change in the Patent Laws

Kiln Drying by Dry Steam

Flavoring Matters

New Corn Planter

Gold Extracting Machinery

Great Old and New Ships

Agricultural Fairs.--Programme for 1856

Recent American Patents

Value of Patents

Resuscitation of Drowned Persons

The Oceanic Survey

Scientific Explorations

A Great Chance for Inventors

The Philadelphia Mint

India Rubber Manufactures

Notes on Patented Inventions.--No. 13

Great Trial of Mowing Machines

The Consumption of Ice

Important Items

Important to Inventors

To Correspondents

Atmospheric Impurity and Disease

Mechanics

For What Purpose were Plants Created

New Galvanic Battery

The Annual Amount of Heat

Raising a Safe from a Sunken Steamboat

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    July 12, 1856

    Beyond XX and XY

    Biology. Identity. Equality.