After this come fifteen books, and then sixteen books of Studies relating to Style. Nine books on Ratiocination. Six books concerned with Mathematics. Two other books entitled Things relating to the Intellect. On Geometers, five books. Commentaries, one book. Contraries, one book. On Numbers, one book. Theory of Numbers, one book. On Dimensions, one book. On Astronomy, six books. Elementary Principles of Monarchy, in four books, dedicated to Alexander. To Arybas. To Hephaestion. On Geometry, two books. These works comprise in all 224,239 lines. Such was his character, and yet, when he was unable to pay the tax levied on resident aliens, the Athenians put him up for sale. And Demetrius of Phalerum purchased him, thereby making twofold restitution, to Xenocrates of his liberty, and to the Athenians of their tax. This we learn from Myronianus of Amastris in the first book of his Chapters on Historical Parallels. He succeeded Speusippus and was head of the school for twenty-five years from the archonship of Lysimachides, beginning in the second year of the 110th Olympiad.* He died in his 82nd year from the effects of a fall over some utensil in the night. Upon him I have expressed myself as follows °: