[Footnote 78: Phocaea is not enumerated by Pliny (Hist. Nat.
xxxv. 52) among the places productive of alum: he reckons
Egypt as the first, and for the second the Isle of Melos,
whose alum mines are described by Tournefort, (tom. i.
lettre iv.,) a traveller and a naturalist. After the loss
of Phocaea, the Genoese, in 1459, found that useful mineral
in the Isle of Ischia, (Ismael. Bouillaud, ad Ducam, c.
25.)]