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An Historical Review of Their Discovery, and Modern Methods of Employment

By William J. Hancock

The Future of Selenium

By Fournier d*amp*apos;Albe

Glass Grinding and Polishing

How the Surface Prepared for Optical Purposes Is Formed

By James Weir French

The Perception of Flashes of Light

Yellow Bricks

A Quality of Electrolytic Iron

The Training of the Chemical Student

For Work in the Factory

By F. G. Donnan

Animals that make Trouble for Themselves

Gathering Turpentine

Suggestions for Prolonging the Naval Stores Industry

By Samuel J. Record

A Convenient Method of Fixing Carpets and Hangings

Some Applications of Fluorescence and Phosphorescence

By J. S. Dow

Securing Window Glass

Timber Decay

And its Growing Importance to the Engineer and Architect

By C. J. Humphry

Appearance and Disappearance of Islands in the Pacific

The Molds that Injure Paper

By Pierre S*amp*eacute;e

Life on Glaciers and Snow Fields

Animals and Plants that Flourish Amid Snow and Ice

By Titus Ulke

A New use for Old Lamp Bulbs

The Pendulum Tank for Testing Ship Models

Calico Printing

Its Origin and Developme

By Robert Reoch

Elderly Men Still Useful


  • The Septic Problem in War

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May 19, 1917

Confronting Common Wisdom