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Muscular Activity and thought Processes

Various Psychological Theories Reviewed

By Knight Dunlap

Parenty's Outflow Regulating Devices

Poisoning Tree Scale

An American Aeroplane with Adjustable Wings

Improvements Necessary to Make Flying Safe, Practical and Commercial

By Carl Dienstbach

A Home made Electric Incubator and Brooder

A Safe, Simple and Efficient Device for the Home Mechanic

By Charles B. Hayward

Pasteur's Words in Mankind's Struggle

New Experiments of M. Eiffel

Further Light on Aeroplane Problems

By A. J. A. Delaunay

The Care of the Wounded

A Vast and Complicated System of Which Little is Heard

Soil Erosion in South Africa

Disinfecting the Mouth with Ultra—Violet Rays

A New Way to make Steel Joints

Some Novel Slow-Speed Motors

A New Power System Utilizing Different Voltages

Manufacturing Conditions in Germany

Approximate Measurement of Textile Fibers

By N. A. Cobb

New Experiments with Liquid Air

Design of Floats for Hydro-Aeroplanes—II

Giving the Results of Tank Experiments with Various Models

By G. H. Millar

Fuel Alcohols

By Aug. Zimmermann

Light in Gas-Charged Rooms

Radio-Activity and Atomic Numbers


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