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The New Railroad Bridge at Vancouver

By J. Mayne Baltimore

Experiments with Rope and Belt Drives

Turbine Propellers

A Critical Review of Recent Developments

Heat in Steam

Its many Operating Conditions

By Joseph H. Hart

Foreign Aeronautic Motors.—III

Some of the Lightest Motors of the 4-Cylinder and 2-Cylinder Types. By the Paris Correspondent of the Scientific American.

Darwinism Fifty Years After

The Biological Lesson of Evolution

By David Starr Jordan

Electroculture of Plants

An Account of some Recent Experiments

Petroleum in 1908

The Life History of the Termite

A Formidable Tropical Pest

By K. Escherich

A $500 Prize for a Simple Explanation of the Fourth Dimension

The Mechanism of the Human Brain

The Laws that Govern Psychic Phenomena

By Robert Fuerstenau

The Production of Ozone

The Effect of Heat

By Arthur W. Ewell

Glass Brick: A New Building Material

How it is made and Employed

The New Reducing Agents Employed in Metallurgy

Reaction Propellers for Aeroplanes

Recent Progress with the X-Rays

Some New Discoveries

By G. W. C. Kaye

Earthquake Forecasts.—I

Future Possibilities

By G. K. Gilbert

Electrical Notes

Engineering Notes

Science Notes


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    February 27, 1909

    20% Sitewide for President's Day