Volume 30, Issue 17
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Features
A Neglected Source of Food
The Astronomical Conditions of Life
Reclaiming the Desert Places
Improvements in Sugar Making
Pumping Engine Economy
The Separation of Tar and the Manufacture of Sulphate of Ammonia from Waste Products
Recent Boiler Explosions
Scientific and Practical Information - April 25, 1874
Improved Grate Clearing Attachment
The Shaker Sash Balance
Munson's Improved Lightning Rod
Modern American Lighthouses
Recent American and Foreign patents - April 25, 1874
Importance of Advertising
Answers to Correspondents - April 25, 1874
Communications Received - April 25, 1874
Canadian Patents - April 25, 1874
LIST OF PATENTS GRANTED IN CANADA,
MARCH 27, 1874.