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Features

Muscle Shoals--Bonanza or White Elephant?

By Alfred P. Lane

A New Plan for Traffic Laws

It Is Stops, Not Speeds, that Matter

By H. W. Szausore

Locust Fighting

A Battle that Man Never Wins, But Never Gives Up

The Marvelous Speeds of Atomic Particles

Saving St. Paul's Cathedral

Failures of Medieval Cathedrals Foreshadowed the Present Trouble at St. Paul's

By J. Bernard Walker

How the Average Man of Seventy-Two has Spent his Life

Last Word on the 5-5-3 Ratio

House Naval Committee Decides that Our Battleship Fleet Is Up to Standard

By J. Bernard Walker

Did Man Evolve in Africa?

An Account of the Remarkable Fossil Man-Ape Recently Discovered in Africa by Professor Dart

By Albert G. Ingalls

A Policy for the Conservation of Our Wild Game

A Bird Census

Mechanical Gas

How Our Giant Electric Power Industry Is Turning to Powdered Coal for Its Fuel

The Manufacture of Thermometers

Photographs by Taylor Instrument Company

Are there Other Habitable Worlds?

Astonishing Deductions from Recent Theories of Energy in the Stars

By Henry Norris Russell

Story of Steel--XIII

Mechanical Safeguards and Safety-first Teaching Protect the Life and Limb of the Steel Worker

Mighty Hunters in the World of Ants

Some Epic Encounters that Go On Each Summer Hour Within the Grass-blade Forests of Our Lawns and Fields

By S. F. Aaron

This Laboratory Can Supply Electric Currents with the Tremendous Potential of Over a Million Volts

News for Inventors

A Department of Facts and Notes of Interest to Patentees and to Owners of Patent and Trademark Rights

By Milton Wright

The "Margery Mediumship"

The following statement by Dr. McDougall, member of the Scientific American's Psychic Committee, was printed in the Boston Evening Transcript for February 18, 1925, and is reprinted here by courtesy of the editor of that newspaper. Formal statements by the members of the Psychic Committee (including Dr. McDougall) regarding the Margery case were printed in the Scientific American for April, 1925. Dr. McDougall's article, given below, is in amplification of his previous statement and outlines some of the evidence on which the claim of Margery to the Scientific American's prize was rejected by the Committee

By William McDougall

Departments

  • Learning to Use Our Wings, May 1925

  • Departments

    Our Point of View, May 1925

  • Inventions New and Interesting, May 1925

  • Recently Patented Inventions, May 1925

  • The Scientific American Digest, May 1925

  • Science Notes, May 1925

  • Science and Money, May 1925

  • The Heavens in May 1925

  • Radio Notes, May 1925

  • Notes and Queries

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May 1925

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