Epidemiology and Recent Epidemics
Suppressing Epidemics by Fighting the Disease at its Source
Features
Better Concrete—I
Motion Picture Studies of Existing Conditions; Suggested Improvements
What is an Incandescent Lamp?
Vacuum versus Gas-filled Lamps and the Relation between Life and Efficiency
Refinements in Turbine Design
Some Details that are Open to Improvement
Heterodyning Wavemeter
Is Alcohol Dead?
A Discussion of the Necessities and Possibilities of Greatly Increased Future Producing of Fuel Alcohol
Life Habits of Insects Recorded with the Camera
Fabre's Study of the Scarab
The Langmuir Postulates—II
An Introduction to Dr. Irving Langmuir's New Theory of the Constitution of Atoms and Molecules
The Rotary Method of Well Drilling
Combining Rotary and Cable-tool Methods in Alternating Soft and Hard Formations
Spectral Structure of the X-Rays
Use the Dead and Dying Chestnut
Importance of Immediately Salvaging Wood of Trees Killed by Fungus Growth
Problems in the Utilization of Fuels—II
Economic Use of the Poorer Grades of Coal and Oils
