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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

Chemistry and Agriculture

The Sleeping Sickness

By A. Acloque

The New Wireless Telegraph Station at Nauen, Germany

By L. Ramakers

An Automobile Emergency Wagon for Fire Departments

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

Variation in Horse-Power Developed by Automobile Gas Engines

By A. E. Potter

Some Facts about the Carnegie Institute

The Fraternizing of the Great Nations through Science

Excavations in Chaldæa

By the Paris Correspondent of the Scientific American

Brain Weight and intelligence

By J. Draeseke

The Decline of the Sunspot Maximum

By Rose O*amp*apos;Halloran

Grain Golah at Bankipur

The Effect of Light on Bacteria

Radium and Geology

Production of Fuels in 1905

Electrical Notes

Trade Notes and Formulæ

Engineering Notes

Science Notes


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January 26, 1907

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