With the publication of this book I discharge a debt which our era has long owed to the memory of a great mathematician of antiquity: to pub- lish the /llost books" of the Conics of Apollonius in the form which is the closest we have to the original, the Arabic version of the Banu Musil. Un- til now this has been accessible only in Halley's Latin translation of 1710 (and translations into other languages entirely dependent on that). While I yield...