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The Chemist Looks at Business Cycles

By D. H. Killeffer

A New Way to Control Rickets

By James A. Tobey

Space as Yet Unfathomed

By Henry Norris Russell

Better Engines for Navy Planes

By C. A. Pownall

Speeding up Railway Freight

Man-Made Oases in American Deserts

As population has increased, so, too, has the demand for water—and the controversies over who owns it

By Elwood Mead

Poland Becomes a Maritime Nation

By Jacques Boyer

Has Forest Conservation Created a False Alarm?

American Forests, Washington, D.C.

By Wilson Compton

Modern Coal for Modern Markets

By Albert A. Hopkins

Trademarks in Disguise

By Sylvester J. Liddy

How Stable is the Earth's Crust?

By Harlan T. Stetson

From the Archeologist's Note Book, December 1931

Butterfly Faking--a New Industry

Stone Age Man's World-Wide Culture

By J. Reid Moir

Index to Volume 145, July-December, 1931


  • Departments

    Across the Editor's Desk, December 1931

  • Back of Frontispiece, December 1931

  • Where Bacteria Hold the Center of the Stage

  • Our Point of View, December 1931

  • New Waterproof Lime, First Translations of Maya Glyphs and more

  • Radio Tube Suits Settled, "Developing" Cream Advertised as a Body Builder, and more

  • Books Selected by the Editors, December 1931

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