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