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Features

A Button Industry from Ocean Pearl

By Grace Lockhart

Wild Life in a Fire

By Duane H. Kipp

Flying Instruction as it Should Be

By George W. Orr

How you are Influenced by Color

By Solon R. Barber

Is Interstellar Space Wholly Empty

By Henry Norris Russell

A Day With a Locksmith

By Albert A. Hopkins

The Perspective of Modern Physics

By Paul R. Heyl

A Tinted Statue From Pompeii's Ashes

It Pays to be a Pioneer

By Milton Wright

Natural Gasoline from Oil Wells

By G. Ross Robertson

Pose Yourself For Your Portrait

Into a Hidden World

By M. C. Swingle

Asquith and Kitchener

(Concluded from August)

By W. D. Puleston

"Form" Letters With A Personal Touch

World Affairs and the Telephone

Cotton Cloth Fit for a King

By Donald A. Laird

Departments

  • How Ancient is Modern Man?

  • Departments

    Across the Editor's Desk, September 1931

  • Back of Frontispiece, September 1931

  • France's Reply to Germany's "Pocket Battleship"

  • Our Point of View, September 1931

  • New Soap has no Taste, A Telephone Call-Recorder and more

  • Single Court of Patent Appeals, Inventor Convicted of Fraud and more

  • Books Selected By The Editors, September 1931

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September 1931

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