Features
Edison's Inventions.— I
Their Commercial Value to the World
Extraction of Potash and Soda from Minerals
Influence of Over-Voltage on the Life of Metallic-Filament Lamps
Testing the Hardness of Metals
A Review of Methods in use
The Efficiency of Aerial Propellers
A New Investigation and its Results
Safeguarding Wood against Ants
Experimenting with Animals and Plants
Studies in Artificial Mutation
The Sense of Hearing in Insects
Silver Plating
The Various Methods now in use
Science Interpreted by Children
Saponification with Ammonia
Scale for Barometers
Wave Motion Visually Presented
Projection Demonstration to Accompany Lectures on Wave Motion
A Writing Cam
A Novel Piece of Mechanism
Recent Progress in the Manufacture of Various Gases
A Noteworthy Anthropological Discovery
Stuttering and Stammering
The Psychology of Speech
Weeds that are used in Medicine
Some Simple Botanical Facts
