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Some Present-Day Techno-Chemical Problems

Illustration of the Opportunities for Applying Scientific Knowledge to Industries

By Raymond F. Bacon

Sentencing the Hawks

Red Squirrels

Air Temperature in the Tropics

Plants and Asphyxiating Gases

Trenching by Machinery

Power Devices that Facilitate the Work of the Contractor

By Frank C. Perkins

A Gas Pressure Reducer

Cork Fabric for Featherweight Raincoats

Physiological and Pharmacological Studies on Coal Tar Colors

Tone Reproduction in Photography and its Limitations

Antagonistic Action of Salts in Plants

Tenacity to Life in Insects

By Robert Cunningham Miller

A Cadmium Vapor Lamp


Some of Their Economic Uses and Possibilities

By Marshall A. Howe

Chemical Properties of Molybdenum

The Mahogany Tree

Most Valuable Member of Tropical American Forests

By C. D. Mell

Ancient Rock Carvings in Sweden

The American Egypt


Some Experiments and Notes on Photographic Reducers

Reply to Mr. Norman J. Symons' Article in Scientific American Supplement, Dec. 9th, 1916

Cipher Codes

Photo-Micrography for the Amateur

A New Method that is Simple and Inexpensive

By Arthur Palme

Decrease in Number of Live Stock in France

Luminescence Measurements

By N. E. Dorsey

Electrical Treatment of the Wounded

Recent Methods Developed During the War

By W. J. Turrell

The Insulating Properties of Asbestos

Weight of Steel in New War Vessels

Use of Molybdenum in Chemicals

Use of Molybdenum in Stellite

A Correction

Methods for Preserving Bread

For French Prisoners in Germany


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