Modern Aeronautics—I
A Review of some Outstanding Problems
Features
Origin of the Nonius
The Aurora
Is it possible to explain it by means of a Copuscular Ray Theory
The Psychology of Color–II
Color as a form of Consciousness
Imports of Palm Oil
Waterproofing Compositions
Ancient Methods for Stripping Films
Factors Influencing the Spread of Parasites
The Ornithopter
National Economy in England
Use of Chromic Acid and Hydrogen Peroxide as an Etching Agent
How can Soft Coal be Burned without Smoke in Marine Boilers?
Valonia Tanning Material
Science applied to War
Substitutes for Wheat
Employed in Making Bread for the French Army
Position-Light Signals for Railroad Service
Printing Ink for Half-Tone Work
The use of Soap Films
In solving Torsion Problems
Correspondence
On Severe Winters
Contact Insecticides
Physical Properties Governing their Efficacy
