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Briquettes Made with Tar

Electricity in the Packing Plant

Some New Labor-Saving Devices

By Frank C. Perkins

Heat-Balancing in Locomotives

Studies in Combustion and Radiation

By Lawford H. Fry

The Phenomenon of Tribo-Luminescence

By the Paris Correspondent of the Scientific American

The Assimilation of Free Nitrogen by Bacteria

The Duddell Thermo-Galvanometer

A Device for Measuring Extremely Small Currents

By A. Frederick Collins

An Experimental Model Basin.—I

A Brief Description of its Functions and Operation

By R. H. M. Robinson

Reed Laths in Sweden

The Speed of an Aeroplane

How it may be Determined

By A. F. Zahm

The making of Moving Pictures—II

How Their Fantastic Effects are Obtained

By Gustave Babin

Artificial Rocks and Minerals

An Important Physical Study

By A. Michel-Levy

Census of High Buildings

The Algerian Sahara

Refrigerator Cars

One-Horned and Three-Horned Sheep

Biological Curiosities

By Henry Serffait


A Scientific Theory of Heredity

By M. A. Lane


Its Present Commercial Status

By A. Cressy Morrison

Simple Apparatus for Measuring the Index of Refraction

By F. R. Gorton

Engineering Notes

Trade Notes and Formulæ


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    July 18, 1908

    20% Sitewide for President's Day