Volume 67, Issue 1735supp
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Features
Edison's Inventions.— I
Their Commercial Value to the World
Influence of Over-Voltage on the Life of Metallic-Filament Lamps
Extraction of Potash and Soda from Minerals
Testing the Hardness of Metals
A Review of Methods in use
Safeguarding Wood against Ants
The Efficiency of Aerial Propellers
A New Investigation and its Results
Experimenting with Animals and Plants
Studies in Artificial Mutation
The Sense of Hearing in Insects
Silver Plating
The Various Methods now in use
Saponification with Ammonia
Scale for Barometers
Science Interpreted by Children
Wave Motion Visually Presented
Projection Demonstration to Accompany Lectures on Wave Motion
Recent Progress in the Manufacture of Various Gases
A Writing Cam
A Novel Piece of Mechanism
A Noteworthy Anthropological Discovery
Stuttering and Stammering
The Psychology of Speech
Weeds that are used in Medicine
Some Simple Botanical Facts