Volume 132, Issue 5
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Features
A New Plan for Traffic Laws
It Is Stops, Not Speeds, that Matter
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
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
Did Man Evolve in Africa?
An Account of the Remarkable Fossil Man-Ape Recently Discovered in Africa by Professor Dart
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
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
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
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