Volume 30, Issue 8
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Features
The Iron Ores of Missouri
The State of the Iron Trade
Ozone-A New and Correct Method of Supply
Education and Book Knowledge
Modern Progress of Chemical Industries in Europe
The Heberlein Brake
The English Telegraphs
South African Wonders--Explosive Diamonds and Turtles with Teeth
The Siamese Twins
Professor R. A. Proctor
Scientific and Practical Information - February 21, 1874
The Ribbon Post
Combined Lounge and Bath Tub
Improved Cotton Worm Destroyer
Improved Bearing for Shafting
The Artificial Manufacture of Butter
Importance of Advertising
Decisions of the Courts - February 21, 1874
United States Circuit Court--Northen District of Illinois
Recent American and Foreign Patents - February 21, 1874
Answers Correspondents - February 21, 1874
Communications Received - February 21, 1874
Canadian Patents - February 21, 1874
List of Patents Granted in Canada, January 3, 1873