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Features

Combined Ice-Breaking, Salvage, and Survey Steamer for the Canadian Government

By the English Correspondent of Scientific American

Some Problems Connected with Deep Mining in the Lake Superior Copper District

By F. W. McNair

A Mechanical Model for the Lecture Demonstration of “Beats”

By Will C. Baker

The Mineral Production of the United States in 1905

Industrial Activity in 1906 as Exemplified by Foreign Trade

Practical Tests of the Gyrostat for Ships

By Otto Schlick

The New incandescent Electric Lamps.—I

The Sleeping Sickness

By A. Acloque

Chemistry and Agriculture

The New Wireless Telegraph Station at Nauen, Germany

By L. Ramakers

The Conductivity of Air in an Intense Electric Field, and the Siemens Ozone Generator

An Automobile Emergency Wagon for Fire Departments

Variation in Horse-Power Developed by Automobile Gas Engines

By A. E. Potter

The Fraternizing of the Great Nations through Science

Some Facts about the Carnegie Institute

Excavations in Chaldæa

By the Paris Correspondent of the Scientific American

The Decline of the Sunspot Maximum

By Rose O*amp*apos;Halloran

Brain Weight and intelligence

By J. Draeseke

Production of Fuels in 1905

Radium and Geology

The Effect of Light on Bacteria

Grain Golah at Bankipur

Electrical Notes

Engineering Notes

Trade Notes and Formulæ

Science Notes

Departments

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January 26, 1907

Confronting Common Wisdom