Roman Technics and Industry in Early Germany
A Commercial and Technical as well as a Political Conquest
Features
Agricultural Fertilizer
Biochemical Systems
And Their Function in the Development of the Organism
Oxy-Acetylene Welding
How to Make a Complete Oxy-Acetylene Welding Outfit
A Physiological Puzzle
Hypnosis of Animals and Insects and Comparisons With Human Beings
Reinforced Concrete Aqueduct
Glass Surfaced Roads
Color Photography
A Brief Review of Its History and Details of Development
German Plants in Belgium
The Spinning of a Web
A Wonderful Bit of Engineering and Technical Skill
“Standardizing” the Art of Voice Production
The Fundamental Underlying Principle of Developing the Vocal Muscles
Concentration and Co-operation in Science
An Insoluble Seal for Letters
The Chemistry of the Incandescent Gas Mantle
The Materials Employed and the Steps Taken in its Improvement
Industrial uses of Hydrofluoric Acid
The Artificial Production of Pearls
Correspondence
The Gas from Blast Furnaces—IV
Its Cleaning and Utilization
