Improved Breech-Loading Cannon

Inventions and Discoveries Abroad

Miscellaneous Summary

Scientific Information--British Association for the Advancement Of Science

The Great Works of the Period

The Indian Summer

The New Postal Currency

Tramping Mechanics

Packing the Ends of Condenser Tubes

Concerning Safety Valves

Don't Stand Idle

The Supply of Petroleum

An Astronomer on Boiler Explosions

Prevention of Decay in Wooden and Iron Ships

An Impenetrable Armor Ship

Harbor Defenses

Patent Claims

Issued from the United States Patent-Office

Recent American Patents

To Our Readers