[Footnote 12: The situation of the fortress, and the
topography of the Bosphorus, are best learned from Peter
Gyllius, (de Bosphoro Thracio, l. ii. c. 13,) Leunclavius,
(Pandect. p. 445,) and Tournefort, (Voyage dans le Levant,
tom. ii. lettre xv. p. 443, 444;) but I must regret the map
or plan which Tournefort sent to the French minister of the
marine. The reader may turn back to chap. xvii. of this
History.]