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The Underground and Elevated Electric Railway in Berlin—Now Completed and in Operation

By Frank C. Perkins

New Process for Ore Concentration

Russian and American Petroleum

The Block System

Recent Progress in Large Gas Engines

Researches on Argon and its Combinations

By M. Berthelet

A Power Milk Separator

Report of Bureau of Steam Engineering on Liquid Fuel for Naval Purposes

Restorative Power

Post Office Statistics

Apparatus for Short-Distance Stereoscopic Photography

The French First-Class Battleship “Gaulois.”

Failure of Volapuk

Some Practical Suggestions on Mosquito Extermination in New Jersey

By Henry Clay Weeks

The Forests of Russia

Cotton Seed Rendered Immune

The Lorenz Operation

Reclaiming Swamps

Distribution of Current at the Surface of Cathodes in Vacuum Tubes

By A. Wehnelt

What the United States of America is doing for Anthropology

South African Coal Fields

Trade Suggestions from United States Consuls

Selected Formulæ


Trade Notes and Recipes


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