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Features

Heroes of Mapmaking

From Alaska's Snows to Dismal Swamps, Pluck and Energy Is Completing the Largest Map in the World

By Guy Elliott Mitchell

Everybody Should be Fingerprinted

A System of Universal Registration Would Benefit Especially Those Who Were Recorded

By Richard E. Enright

Can Old Age be Deferred?

An Interview with Dr. Serge Voronoff, the Famous Authority on the Possibilities of Gland Transplantation

The Barnard Ultra-Microscope and Photo-Micrographs of the Cancer Germ

Cracking the Lead Atom

How the Romantic Quest of the Alchemist—the Transmutation of One Metal Into Another—Is Being Scientifically Pursued by Two Dutch Savants

By A. Smits and A. Karssen

Making the Movie Film Give the Music Cues

With This Invention the Orchestra Leader Need Never Look at the Screen

Checking the Magnetic Permeability of Iron

A New Method for the Quick Testing of Cores and Wire for Radio and Other Apparatus

By Paul B. Findley

Evolution, From the Nebula to 1925

The Story Outlined by the Chart on the Opposite Page

By Albert G. Ingalls

The World's Largest Leper Colony

Great Strides Have Been Made in the Conquest of This Dread Disease

By Victor G. Heiser

On their Way in Thirty Seconds

How the Speedy and Accurate Transmission of Fire Signals Is of Vital Importance

By Val. Fendrich

The New, or Modified, Form of the Theory of Stellar Evolution

By Henry Norris Russell

The Progress of Medical Science--I

The First of a Series of Four Articles on the Modern Advance in Medicine and Surgery

By Morris Fishbein

Super-Radio to Span the Atlantic

New and Powerful Broadcasters in the United States, England and Germany Are Ready to Exchange Programs This Winter on an International Scale

By Orrin E. Dunlap Jr.

Light Waves or Light Bullets?

Recent Experiments Show that Light Rays Act Like Projectiles in Knocking Electrons Out of Matter. A Revision of the Time-honored Wave Theory of Light Is Suggested

By Arthur H. Compton

Elevators With Electric Brains

By Albert A. Hopkins

New Treaty Battleships "Nelson" and "Rodney"

The British Interpretation of the Lessons of the Jutland Battle

By Hector C. Bywater

Which Radio Set is Ideal for You?

The Fourth Month of Our New Service to Radio Set Purchasers

News for Inventors, October 1925

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

By Milton Wright

Departments

  • Learning to Use Our Wings, October 1925

  • Departments

    Our Point of View, October 1925

  • Inventions New and Interesting, October 1925

  • Recently Patented Inventions, October 1925

  • The Scientific American Digest, October 1925

  • The Heavens in October 1925

  • In the Editor's Mail, October 1925

  • Science and Money, October 1925

  • Radio Notes, October 1925

  • Notes and Queries, October 1925

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October 1925

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