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The Conductivity of Metals

A New Theory of the Passage of Electricity Through Metals

By J. J. Thomson

Extinguishing Fire with Kerosene

Pontoon Bridges and Rafts

How an Army Moves Itself Across Rivers

The Lignite of North Dakota

Cooling Water and Air for Power Plants

The U. S. Battleships in the Panama Canal

Measurements with the Micropyrometer

An Excursus on Geological Time

A Review of Various Methods of Estimating the Age of the Earth

Electrolytically Produced Hypochlorites

Rank of Coal-Producing States

The Government uses Motion Pictures

By C. J. Blanchard

The Therapeutic uses of Preparations of the Ductless Glands—I

Notes on Experimental Investigations of Undoubted Future Value

By Robert G. Torrey

Foreign Sources of Artificial Dyestuffs

Hospital Efficiency

Hydraulic Turbines

Wheels and Pumps at the Panama-Pacific Exposition

By H. J. Kennedy

Evolution of the Modern Dry Plate

Its History, Chemistry and Manufacture

By E. P. Wrightman

Patents in the German Dye Industry

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August 21, 1915

Think Outside the Gift Box