The treatise on conic sections by Apollonius of Perga, who was born in the reign of Ptolemy Euergetes, and died during that of Ptolemy Philopater, who ruled 222-205 B.C. It is stated on fol. 52b that Apollonius dedicated the first three books of his conic sections to Eudemus. The treatise was originally in eight books, of which only the first four were known in Europe. About the middle of the seventeenth century the next three books were translated from an Arabic MS. dated 1250 C.E. The complete eighth book is still missing. In 1710 C.E. Edmund Halley, Savilian Professor of Geometry at Oxford, tried to restore the last book on the basis of the introductory lemmata of Pappus. The present MS. is divided into 8 parts.