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Features

Electric Power Installation near Butte, Montana

Electrolytic Manufacture of Zinc

Liquid Fuel for Steamships

By Edwin L. Orde

The Chemical Factor in Human Progress

By Peter T. Austen

A Parisian Puppet Theater

The Protected Cruiser “Des Moines.”

Dredging for Gold

History of Cold and the Absolute Zero

By James Dewar

French Infant Mortality

An Evil Consequence of the “Pince-Nez.”

Man as a Heat Engine

By K. Schreber

Volcanoes

The Spider-Hunters

Personal Narrative by Capt. Sverdrup of his Arctic Trip

A New Telephone Relay

Selected Formulæ

Patents!

Trade Suggestions from United States Consuls

Departments

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