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Features

A Nation in Perspective

How Canada Has Brought Her Scenery and Resources to the Panama-Pacific Exposition

By Edward H. Hurlbut

Photo-Electricity—II

The Intimate Relations of Light and Electricity

By J. A. Fleming

How a 25 Per Cent. Saving was Made

Problems of Geographic Influence

Differentiation of the White Race

Poles for Electric Transmission Lines

The Range-Finder

How Distances are Measured on the Battlefield

The Early History of Opium

The Velocity of Hertzian Waves

Long-Distance Measurements; Apparatus Used and Results Obtained

By H. E. Saunders

Experimenting with Searchlights

Instruments used on Aeroplanes

Comments on Their Functions and Defects

Graphite

The Manufacture of Condensed Milk, Casein, Etc.—II

Discussion of Methods of Analysis

By R. T. Mohan

Modern Substitutes for Butter

Wholesome Materials that Have Long Been Under Suspicion

Built-in Hollow Method for Mounting Small Mammals

Typhus Fever

Fine Measuring Tools for Machinists

Cartridge Cases for Field Gun Ammunition

Ingenious Methods of Making the Powder Container for Rapid-Fire Guns

By Douglas T. Hamilton

Cost of Electric Steel Making Furnaces

The Mobilization of War Raw Materials in Germany

Making Shrapnel Bullets

Where the Mathematician Could Aid the Astronomer

The Desirability of Co-operation Between Different Branches of Science

Kinds of Coal Produced in the United States

Salts Colored by Cathode Rays

World's Shipbuilding

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    July 10, 1915

    Think Outside the Gift Box