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Development of the Electric Railway

A Record of Marvelous Growth

By James N. Hatch

Rural Depopulation in Germany

Pneumatic Caissons.—II

How they are Employed in Engineering Construction

By T. Kennard Thomson

Block Signal Train-Indicating

The Emergency Safety Equipment in the East River Tunnels, New York

The Hedjaz Railroad

The New Sacred Line Between Damascus And Mecca. By the English Correspondent of the Scientific American.

A New Germicide

The Seasonal Activities of Plants

Factors Affecting Development and Distribution Director of the Department of Botanical Research, Carnegie Institution

By D. T. Macdougal

The Sanitary Cement Block House

Its Use in the Treatment of Tubercu Losis

Ultra-Violet Rays

Their Chemical and Physiological Effects

By Ludwig Gunther

Some Astronomical Fallacies

Facts Not Mentioned in Books

By J. E. Gore

Constitution of the Protein Molecule

Engineering Notes

Trade Notes and Formulæ

Electrical Notes


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