Heroes of Mapmaking
From Alaska's Snows to Dismal Swamps, Pluck and Energy Is Completing the Largest Map in the World
Features
Everybody Should be Fingerprinted
A System of Universal Registration Would Benefit Especially Those Who Were Recorded
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
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
Evolution, From the Nebula to 1925
The Story Outlined by the Chart on the Opposite Page
The World's Largest Leper Colony
Great Strides Have Been Made in the Conquest of This Dread Disease
On their Way in Thirty Seconds
How the Speedy and Accurate Transmission of Fire Signals Is of Vital Importance
The New, or Modified, Form of the Theory of Stellar Evolution
The Progress of Medical Science--I
The First of a Series of Four Articles on the Modern Advance in Medicine and Surgery
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
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
Elevators With Electric Brains
New Treaty Battleships "Nelson" and "Rodney"
The British Interpretation of the Lessons of the Jutland Battle
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
Departments
- 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
Learning to Use Our Wings, October 1925
Radio Notes, October 1925
Notes and Queries, October 1925
