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How to Collect and Preserve Insects—II

Methods and Apparatus Used in an Interesting Pastime

By Frank E. Lutz

The Principle of Similitude

A Course of Science Reading

By James Asher

Difference of Longitude Determined Photographically

Direct Determination of Rubber by Combustion Method

The Hoang Ho Bridge

An Important Link in Railroad Communication in the Far East

Leadless Glazes on White-Ware

A New Apparatus for the Direct Measurement of Radioactivity

Of Value in Both Chemical and Electrical Investigations

Radium Therapy

Notes on Results Obtained at the London Radium Institute

Protecting Canal Bottoms against the Erosions Caused by the use of Screw-Propelled Vessels

By Our Berlin Correspondent

The Propulsion of Submarines

German and French Practice

The Protective Treatment against Typhoid Fever

A Device for Regulating Storage Batteries from a Distance

A Direct Reading Psychrometer

By F. W. L. Peebles

An Experiment in Organic Education

Making the Course of Study Fit the Child

By Sidonie Matzner Gruenberg

Street Sprinkling Trolley Cars

Design of Floats for Hydro-Aeroplanes—I

Giving the Results of Tank Experiments with Various Models

By G. H. Millar

Fog Signals by Wireless

Corrosion of Condenser Tubes

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    November 14, 1914

    Help Us Reforest the Mississippi River Valley