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How to Interpret the Facts of Geology

Mount Ætna

Sven Hedin's Exploration in Central Asia

The Erosive Action of the Mississippi

The “Peache” High-Speed Engine at the Glasgow Exhibition

Gold Supply and History

Machine for Raising Water by the Method of Archimedes' Screw

The Liverpool Motor-Vehicle Trials

The Progress of Science

By R. S. Woodward

Experiments with Sound Signals

The Scale Insect and Mite Enemies of Citrus Trees

By C. L. Marlatt

How Arctic Animals Turn White

By R. Lydekker

Photographic Novelties

Development of the Kentucky Asphalt Deposits

Electrically-Operated Pumps

By Frank C. Perkins

Selected Formulæ

Contemporary Electrical Science

Trade Suggestions from United States Consuls

Trade Notes and Receipts



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