Virtue may be transmitted; one about the Existent; one on Fate; one on the Passions; one on Lives; one on Unanimity; two on Pupils; one on Justice; two on Virtue; one on Species; two on Pleasure; one on Life; one on Manly Courage; one on The One; one on Ideas; one on Art; two on the Gods; two on the Soul; one on Knowledge; one on the Statesman; one on Science; one on Philosophy; one on the School of Parmenides; one the Archedemus, or an essay on Justice; one on the Good; eight of those things which concern the Intellect; ten essays in solution of the difficulties which occur respecting Orations; six books on the study of Natural Philosophy; the Principal, one; one treatise on Genus and Species; one on the doctrines of the Pythagoreans; two books of Solutions; seven of Divisions; several volumes of Propositions; several also about the method of conducting Discussions. Besides all this, there are one set of fifteen volumes, and another of sixteen, on the subject of those studies which relate to Speaking; nine more which treat of Ratiocination; six books on Mathematics; two more books on subjects connected with the Intellect; five books on Geometry; one book of Reminiscences; one of Contraries; one on Arithmetic; one on the Contemplation of Numbers; one on Intervals; six on Astronomy; four of elementary suggestions to Alexander, on the subject of Royal Power; one addressed to Arybas; one addressed to Hephæstion; two on Geometry; seven books of Verses.
X. But the Athenians, though he was such a great man, once sold him, because he was unable to pay the tax to which the metics were liable. And Demetrius Phalereus purchased him, and so assisted both parties, Xenocrates by giving him his freedom, and the Athenians in respect of the tax upon metics. This circumstance is mentioned by Myronianus of Amastra, in the first book of his chapters of Historical Coincidences.
XI. He succeeded Speusippus, and presided over the school for twenty-five years, beginning at the archonship of Lysimachides, in the second year of the hundred and tenth olympiad.