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Features

Address of the Hon. S. S. Fisher, U. S. Commissioner of Patents Before the American Institute

Roquefort Cheese

Spontaneous Ignition in Woolen Mills

Mack's Improved Feed-Water Heater

Siemens on Patents

The August Meteors

From the Spectator

The Manufacture of Sulphuric Acid

By J. Lawrence Smith

Determination of the Amount of Expansion of Mineral Oils

By Vander Weyde

The Drive Well

Demuth's Improvement in Glass Window Lights

Andrews' Patent Saw Hangings and Saws

The Wandering of Phosphorus in Plants

The Exhibition of the American Institute

The Hydrostatic Paradox

The Natural Advantages of Tennessee for the Production of Iron

Return of C. F. Hall, The Arctic Explorer

Annual Report of the President of the Western Union Telegraph Company

Applications for Extension of Patents

The Torpedo Patent Case

Recent American and Foreign Patents

How to File and Set a Saw

Official List of Patents

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October 16, 1869

Beyond XX and XY

Biology. Identity. Equality.