1. On Beauty (I. 6).
2. On the Immortality of the Soul (IV. 7).
3. On Fate (III. 1).
4. On the Essence of the Soul (IV. 1).
5. On the Intellectual-Principle, the Ideas, and the Authentic-Existent (V. 9).
6. On the Descent of the Soul into the Body (IV. 8).
7. On the Emanation of the Non-Primal from the Primal-Being; and on The One (V. 4).
8. Whether all the Souls constitute One Soul (IV. 9).
9. On the Good or the One (VI. 9).
10. On the Three First Hypostases (V. 1).
11. On the Generation and Order of the Post-Primals (V. 2).
12. On the Two Orders of Matter (II. 4).
13. Diverse Questions (III. 9).
14. On the Circular Movement (II. 2).
15. On our Tutelary Spirit (II. 2).
16. On the Reasoned Dismissal (I. 9).
17. On Quality (II. 6).
18. Whether there exist Ideas of Particulars (V. 7).
19. On the Virtues (I. 2).
20. On Dialectic (I. 3).
21. Why the Soul is described as Intermediate between the Existent having parts and the undisparted Existent (IV. 1).
These are the twenty-one treatises which, as I have said, Plotinus had already written, by his fifty-ninth year, when I first came to him.
5.
I had been, it is true, in Rome a little before this tenth year of Galienus, but at that time Plotinus was taking a summer holiday, engaging merely in conversation with his friends. After coming to know him I passed six years in close relation with him. Many questions were threshed out in the Conferences of those six years and, under persuasion from Amelius and myself, he composed two treatises to establish:—
