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Preface to the Topics, one; Topics relating to the Definitions, two; one on the Passions; one on Divisions; one on Mathematics; thirteen books of Definitions; two of Epicheiremata, or Arguments; one on Pleasure; one of Propositions; on the Voluntary, one; on the Honorable, one; of Epicheirematic or Argumentative Propositions, twenty-five books; of Amatory Propositions, four; of Propositions relating to Friendship, two; of Propositions relating to the Soul, one; on Politics, two; Political Lectures, such as that of Theophrastus, eight; on Just Actions, two; two books entitled A Collection of Arts; two on the Art of Rhetoric; one on Art; two on other Art; one on Method; one, the Introduction to the Art of Theodectes; two books, being a treatise on the Art of Poetry; one book of Rhetorical Enthymemes on Magnitude; one of Divisions of Enthymemes; on Style, two; on Advice, one; on Collection, two; on Nature, three; on Natural Philosophy, one; on the Philosophy of Archytas, three; on the Philosophy of Speusippus and Xenocrates, one; on things taken from the doctrines of Timaeus and the school of Archytas, one; on Doctrines of Melissus, one; on Doctrines of Alcmaeon, one; on the Pythagoreans, one; on the Precepts of Gorgias, one; on the Precepts of Xenophanes, one; on the Precepts of Zeno, one; on the Pythagoreans, one; on Animals, nine; on Anatomy, eight; one book, a Selection of Anatomical Questions; one on Compound Animals; one on Mythological Animals; one on Impotence; one on Plants; one on Physiognomy; two on Medicine; one on the Unit; one on Signs of Storms; one on Astronomy; one on Optics; one on Motion; one on Music; one on Memory; six on Doubts connected with Homer; one on Poetry; thirty-eight of Natural Philosophy in reference to the First Elements; two of Problems Resolved; two of Encyclica, or General Knowledge; one on Mechanics; two consisting of Problems derived from the writings of Democritus; one on Stone; one book of Comparisons; twelve books of Miscellanies; fourteen books of things explained according to their Genus; one on Rights; one book, the Conquerors at the Olympic Games; one, the Conquerors at the Pythian Games in the Art of Music; one, the Pythian; one, a List of the Victors in the Pythian Games; one, the Victories Gained at the Olympic Games; one on Tragedies; one, a List of Plays; one book of Proverbs; one on the Laws of Recommendations; four books of Laws; one of Categories; one on Interpretation; a book containing an account of the Constitutions of a hundred and fifty-eight cities, and also some individual democratic, oligarchic, aristocratic, and tyrannical Constitutions; Letters to Philip; Letters of the Selymbrians; four Letters to Alexander; nine to Antipater; one to Mentor; one to Ariston; one to Olympias; one to Hephaestion; one to Themistagoras; one to Philoxenus; one to Democritus; one book of Poems beginning:

Hail! holy, sacred, distant-shooting God.

A book of Elegies which begins:

Daughter of all-accomplishā€™d mother.

The whole consisting of four hundred and forty-five thousand two hundred and seventy lines.

These then are the books which were written by him. And in them he expresses the following opinions: that there is in philosophy a twofold division; one practical, and the other theoretical. Again, the practical is divided into ethical and political, under which last head are comprised considerations affecting not only the state, but also the management of a single house. The theoretical part, too, is subdivided into physics and logic; the latter forming not a single division, turning on one special point, but being rather an instrument for every art brought to a high degree of accuracy. And he has laid down two separate objects as what it is conversant about, the persuasive and the true. And he has used two means with reference to each end: dialectics and rhetoric, with reference to persuasion; analytical examination and philosophy, with reference to truth; omitting nothing which can bear upon discovery, or judgment, or use. Accordingly, with reference to discovery, he has furnished us with topics and works on method, which form a complete armoury of propositions, from which it is easy to provide oneself with an abundance of probable arguments for every kind of question. And with reference to judgment, he has given us the former and posterior analytics; and by means of the former analytics, we may arrive at a critical examination of principles; by means of the posterior, we may examine the conclusions which are deduced from them. With reference to the use or application of his rules, he has given us works on discussion, on question, on disputation, on sophistical refutation, on syllogism, and on things of that sort.

He has also furnished us with a double criterion of truth: One, on the perception of those effects which are according to imagination; the other, the intelligence of those things which are ethical, and which concern politics, and economy, and laws. The chief good he has defined to be the exercise of virtue in a perfect life. He used also to say that happiness was a thing made up of three kinds of goods: First of all, the goods of the soul, which he also calls the principal goods in respect of their power; secondly, the goods of the body, such as health, strength, beauty, and things of that sort; thirdly, external goods, such as wealth, nobility of birth, glory, and things like those. And he taught that virtue was not sufficient of itself to confer happiness; for that it had need besides of the goods of the body, and of the external goods, for that a wise man would be miserable if he were surrounded by distress and poverty, and circumstances of that kind. But on the other hand, he said that vice was sufficient of itself to cause unhappiness, even if the goods of the body and the external goods were present in the greatest possible degree. He also asserted that the virtues did not reciprocally follow one another, for that

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