Muscular Activity and thought Processes
Various Psychological Theories Reviewed
Features
Parenty's Outflow Regulating Devices
Poisoning Tree Scale
An American Aeroplane with Adjustable Wings
Improvements Necessary to Make Flying Safe, Practical and Commercial
A Home made Electric Incubator and Brooder
A Safe, Simple and Efficient Device for the Home Mechanic
Pasteur's Words in Mankind's Struggle
New Experiments of M. Eiffel
Further Light on Aeroplane Problems
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
New Experiments with Liquid Air
Design of Floats for Hydro-Aeroplanes—II
Giving the Results of Tank Experiments with Various Models
