Features
Carl Akeley's Africa
Which Shall Inherit the Earth--Man or the Insects?
A $35,000,000 Business Home
Worlds From a Catastrophe
Hydro-Electric Power in the Ozarks
To Stop Soil Erosion Losses
Meeting the Emergencies of a Great City
The Big Noise Behind the 'Mike'
The Earth Beneath
Staying the Hand of Time
And Now, It's Seaweed
Kelp from the Pacific Coast May Supply Elements Which Are Now Lacking in Our Diet
Progress and the Telephone
A Book-Print Reader for the Blind
Blasting Roads to Settle Them
Asquith and Kitchener
A Biographical Study of Two Eminent Englishmen
Departments
- Departments
Across the Editor's Desk, August 1931
Back of Frontispiece, August 1931
Correct Time is Essential to Safe Railroading
Our Point of View, August 1931
Marine Electrolysis Eliminator, Pointers on Nail Points and more
Langmuir Patent Invalid, Chemical Patents and more
Books Selected by the Editors, August 1931
