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Features

Bacteria in Antarctica

Various Species found in Snow and Ice, and their Origin

By A. L. McLean

Protection against Aircraft

Theory of Action of Sand Filters

“Doubling” of Crocuses and Daffodils

By Francis M. Fultz

Coal and the Cult of the Skin

Nitric Acid from Nitrogen Oxide

Water Power in Germany

A Fifty-Year Retrospect

Of Naval Marine Engineering in the United States

By C. W. Dyson

Chilling and Case Hardening

Collecting Barbed Wire by Machine

How things Break—I

A Study of the Mechanism of Fractures in Materials

By Charles Freminville

Bacteriology of the “Spanish Influenza”

Mechanism of Development of the Image in a Dry Plate Negative

X-Rays and the War

Winged Victory

Mercury Production

Luminous Rockets and Bombs

Devices for Throwing Light on Hostile operations

The use and Abuse of Steel

Utilization of Rotten Potatoes in the Manufacture of Starch

The Low Temperature Carbonization of Coal

A Review of its History, Theory and Practice

By Edgar C. Evans

High-Speed Steel for Milling Cutters, Taps and Reamers

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    October 19, 1918

    Help Us Reforest the Mississippi River Valley