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The Greatest Technical Blunder of the War, The National Academy of Sciences and the National Government and more

Safety Spurs for a Railroad Grade, The Current Supplement and more

By Harry Chapin Plummer

Strategie Moves of the War—August 19th, 1915

By Matthew E. Hanna

Captive Balloons on the French Front

[Article is illustrated by cover image]

By Neal Truslow

The Business Men's Training Camp at Plattsburg

A Spontaneous Movement of United States Citizens for Self-Defense

Artificial Immunity Against Typhoid Fever

How Mortality of a Dread War Disease Has Been Reduced

By A. M. Jungmann

The Psychology of Baseball, Vividiffusion Experiments on the Ammonia of the Circulating Blood and more

By Arthur Macdonald

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    Recently Patented Inventions - August 28, 1915

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August 28, 1915Image Caption: A Captive Balloon on the French Front
[image illustrates article on page 181]