Note 164 — Chapter IV · THE PROTO-CHALCITIC OR COPPER AGE OF WEAPONS.

So Professor F. Max Müller, Lectures on the Science of Language, asserted, with a carelessness rare in so learned a writer (vol. ii. p. 255. London: Longmans, 1873), that ‘the ancients knew a process of hardening that pliant metal (copper), most likely by repeated smelting (heating?) and immersion in water.’ This latter is the common process for softening the metal.