POTASSIUM AND AMMONIUM.
Occurrence and preparation of potassium.—Potassium chlorate and cyanide.—Gunpowder.—Ammonium compounds
CHAPTER XLVI.
CALCIUM COMPOUNDS.
Calcium carbonate.—Lime and its uses.—Hard water.—Formation of caves.—Calcium sulphate
CHAPTER XLVII.
MAGNESIUM, ALUMINIUM, AND ZINC.
Occurrence and preparation of magnesium.—Compounds of aluminium: reduction; properties, and uses.—Compounds, uses, and reduction of zinc CHAPTER XLVIII.
IRON AND ITS COMPOUNDS.
Ores of iron.—Pig-iron.—Steel.—Wrought-iron.—Properties. —
Salts of iron.—Change of valence and of color