Volume 120, Issue 20
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Features
The Ship-Owners' Point of View, Phantom Limbs and more
The Future of the Archaeologist in Mesopotamia
A Wonderful Field Opened Up to the Explorer
Mobilizing a Lady Bug Army to Fight the Aphis
Plants that Make Stones
The French Problem of Reconstruction--III
The Practical Methods by Which the Devastated Home, Farm and Industrial Plant Are Being Rebuilt
Light and Progress
The Part Played by Artificial Illuminants in the Development of the Human Race
Listening for the Enemy
Sound-Ranging Devices Employed to Locate Hostile Guns, Planes and Submarines
A "Super-Charged" Airplane Engine, Pulling the Trigger by Fluid Pressure and more
World Markets for American Manufactures
A department devoted to the extension of American trade in foreign lands