A History of Electrical Theories
The Changes Which Discovery Have Wrought
Features
Experiments on the Constitution of the Electric Spark
Rebuilding the Paris Telephone System
A Record-Breahing Performance
The World's Wine Crop
Stamp-Vending Machines
The Construction of an Automatic German Device. By Our Berlin Correspondent.
The Problem of Gas Propulsion
Can Precious Stones be Manufactured?
The Chemistry of Gems
Pasteur and Bacteriology
The Passing of the Whale
Catgut for Surgery
How it is Manufactured
The use of African Elephants for Transport Service
Lodging Conditions in Paris and other French Cities
The Ascent of Sap in Plants
A New And Ingenious Theory
A New Three-Color Camera
The Kuch Quartz Mercury Vapor Lamp
What the Substitution of Quartz for Glass Means
The New “Valveless” Motor
A 325-Horse-Power Kerosene Motor
the Engines Designed for the Italian Submarines. Our English Correspondent.
Cæur D'alene District, Idaho
Remarkable Invention by Cowper-Coles
The Direct Production of Copper Tubes, Sheets, and Wire
Whither are we Drifting?
The Motion of the Solar System Through Space
