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