Volume 142, Issue 2
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Features
Looking Ahead With the Editor, February 1930
American Ships and American Prosperity*
A Discussion of the Weak Link in Our Transportation System and the Need of Public Support for a Greater Merchant Marine
How Old Is the Earth?
How Geologists, Physicists, Geophysicists, and Other Scientists Are Pooling Their Knowledge for a Combined Attack on This Ever-fascinating Problem
Rats
The Rat Is Such a Common, Familiar Animal That His Psychology Has Almost Been Overlooked. But Even a Rat Is Interesting
The Radio and the Spectroscope, February 1930
Quarrying Marble, the Token of Eternity
Ancient As the Everlasting Hills, Marble Furnishes a Lasting Material for Building Construction and Memorials
Sea Safety Inventors Receive Their Reward
The Detroit River Is Spanned
At An Extremely Important Point, Economically, a Beautiful Bridge at Detroit Has Largest Span in the World
A Modern Inferno
What the Civilized World Owes to the Scientific Research of the Modern Chemist
Army Flier Secures Record Photograph
Painting With Light in Barcelona
Spectacular Electrical Lighting Effects Enliven the Spanish International Exposition
The Winning Design in Our Light-Plane Contest
A Detailed Description of the Tandem Biplane With Steel Fuselage That Won the Scientific American Medal
The Last Stand of the Nevada Pueblos
In Southern Nevada Another "Lost City" of the Early American Indian Has Been Discovered, Throwing Light on Pre-Columbian History
Opera Comes Into its Own
Combining Offices With an Opera House May Solve Problems of Perennial Deficits
The Business Executive Takes to the Air
Survey Shows Many Firms Operate Company-Owned Planes
A Big Practical Problem for Science
What Will Be the Power Source of the Future, When the Coal Supply of the World Is Exhausted? Photochemistry Offers One Possibility