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Features

English Multicycles for the Blind, A Chapel on a Motor Truck and more

By Frank C. Perkins

Discovery of the Infantile Paralysis Germ

By Genevieve Grandcourt

Lightning Calculations, The Current Supplement and more

Extracting Roots of Numbers by Inspection

By Alfred J. Lotka

Brucker's Balloon Trip Across the Ocean, Protection of Ocean Liners by Subdivision

By Our Berlin Correspondent

Babylonian Excavations by the Germans

How Nebuchadnezzar and his People Lived

By Edgar J. Banks

The Decline of Native Forest Trees in Cities, How the Indians Harvest Wild Rice

Some Means of Prevention

By Myron H. West

Departments

  • Letters

    Correspondence - April 19, 1913

  • Recommended

    New Books, Etc. - April 19, 1913

  • Departments

    Inventions New and Interesting - April 19, 1913

  • Recently Patented Inventions - April 19, 1913

  • Notes and Queries - April 19, 1913

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April 19, 1913