[LETTER III]
The Manufacture of Soda from Culinary Salt; its importance in the Arts and in Commerce. Glass—Soap—Sulphuric Acid. Silver Refining. Bleaching. TRADE IN SULPHUR.
[LETTER IV]
Connection of Theory with Practice. Employment of MAGNETISM as a moving power—its impracticability. Relation of Coals and Zinc as economic sources of Force. Manufacture of Beet-root Sugar—its impolicy. Gas for illumination.
[LETTER V]
ISOMERISM, or identity of composition in bodies with different chemical and physical properties. CRYSTALLISATION. AMORPHISM. ISOMORPHISM, or similarity of properties in bodies totally different in composition.
[LETTER VI]
ALLIANCE OF CHEMISTRY WITH PHYSIOLOGY. Division of Food into nourishment, and materials for combustion. Effects of Atmospheric Oxygen. Balance of CARBON and OXYGEN.
[LETTER VII]
ANIMAL HEAT, its laws and influence on the Animal Functions. Loss and SUPPLY. Influence of Climate. Fuel of Animal Heat. Agency of Oxygen in Disease. Respiration.