Chapter XXXVIL: Sulphur

Separation.--Crystals from fusion.--Allotropy.--Solution.-- Theory of Allotropy.--Occurrence and purification.--Uses.--- Sulphur dioxide

CHAPTER XXXVIII.

HYDROGEN SULPHIDE.

Preparation.--Tests.--Combustion.--Uses.--An analyzer of metals.- -Occurrence and properties

CHAPTER XXXIX.

PHOSPHORUS.

Solution and combustion.--Combustion under water.--Occurrence.-- Sources.--Preparation of phosphates and phosphorus.--- Properties.--Uses.--Matches.--Red phosphorus.---Phosphene

CHAPTER XL.

ARSENIC.

Separation.--Tests.--Expert analysis.--Properties and occurrence.-- Atomic volume.--Uses of arsenic trioxide

CHAPTER XLI.

SILICON, SILICA, AND SILICATES.

Comparison of silicon and carbon.--Silica.--Silicates.--Formation of silica.

Chapter XLII

GLASS AND POTTERY.

Glass an artificial silicate.--Manufacture.--Importance.-- Porcelain and pottery.

CHAPTER XLIII.

METALS AND THEIR ALLOYS.

Comparison of metals and non-metals.--Alloys.--Low fusibility. -- Amalgams

CHAPTER XLIV.

SODIUM AND ITS COMPOUNDS.

Order of derivation.--Occurrence and preparation of sodium chloride; uses.--Sodium sulphate: manufacture and uses. --Sodium carbonate: occurrence, manufacture, and uses.-- Sodium: preparation and uses.--Sodium hydrate: preparation and use.-- Hydrogen sodium carbonate.--Sodium nitrate

CHAPTER XLV.

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

CHAPTER XLIX.

LEAD AND TIN.

Distribution of lead.--Poisonous properties.--Some lead compounds.-- Tin

CHAPTER L.

COPPER, MERCURY, AND SILVER.

Occurrence and uses of copper.--Compounds and uses of mercury.-- Occurrence, reduction, and salts of silver

CHAPTER LI.

PHOTOGRAPHY.

Description.

CHAPTER LII.

PLATINUM AND GOLD.

Methods of obtaining, and uses

CHAPTER LIII.

CHEMISTRY OF ROCKS.

Classification.--Composition.--Importance of siliceous rocks.-- Soils.--Minerals.--The earth's interior.--Percentage of elements