Chap. XXII.-Silicon. Abundance of silicon. Preparation of silicon.
Modifications of silicon. Silicon and hydrogen. Oxide of silicon. Silicic acid.
Soluble silicic acid. Varieties of silicic acid. Silica in natural waters. Silicates.
ormulæ of silicates. Decomposition of silicates. Composition and formula of
silicic acid. Chloride of silicon. Composition of chloride of silicon. Compound
of silicon, hydrogen, and chlorine. Fluoride of silicon. Fluosilicic acid. Fluo-
silicates. Sulphide of silicon. The carbon group
Chap. XXV.-Ammonium-salts. The hypothetical metal ammonium.
Hydrate of ammonium. Chloride of ammonium. Sulphate of ammonium. Ni-
trate of ammonium. Carbonates of ammonium. Sulphides of ammonium.
Chap. XXVI.-Lithium. Spectrum analysis. Rubidium and Cesium.
Thallium
Chap. XXVIII.-Calcium-Strontium-Barium-Lead. Calcium. Car-
bonate of calcium. Calcareous petrifactions. Calc-spar and arragonite. Oxide
of calcium. Hydrate of calcium. Milk of lime. Slaked lime. Mortar. Caustic
lime. Uses of lime. Sulphate of calcium. Plaster of Paris, or calcined gypsum.
Plaster casts. Incrustation of steam-boilers. Hard water. Testing water. Phos-
phates of calcium. Chloride of calcium. Hypochlorite of calcium. Bleaching-
powder. Preparation of chlorine and oxygen from bleaching-powder. Chlori-
metry. Nitrate of calcium. Sulphydrate of calcium. Sulphite of calcium. Me-
tallic calcium.-Strontium and barium. Peroxide of barium. Making oxygen
with peroxide of barium. Strontium salts. Barium salts. Uses of strontium