Metal work—The bronze family: brass, copper, and their various colours and patinæ—Beaten iron work—Arms and armour—Artificial rust and chemical oxidation—When the imitators of arms and armour used steel and when iron—Cast iron pieces—Chemical tests—Difficulties in the connoisseurship of arms and the story of three shields—Old and modern imitations—Silver work—Its colour and oxidization—Why artistic pieces in precious metal are in danger of being destroyed—Fashion one of the dangers of silver plate—How far reliance may be placed in marks—Gold work—The tiara of Saitafernes—Jewels and their extreme rarity—Imitations and forgeries of all ages—Advice to the non-initiated in the art of buying jewels.