[415] Porph., Vita, cap. xviii.
[416] Porphyry says six, but there must be a mistake somewhere, as Plotinus was fifty-nine when their friendship began, and died in his sixty-sixth year; while Porphyry’s departure for Sicily took place two years before that event, leaving, at most, five years during which their personal intercourse can have lasted, if the other dates are to be trusted.
[417] Enn., III., ii. and iii.
[418] Plotini Opera recognovit Adolphus Kirchhoff, Lipsiae, 1856, in Teubner’s series of Greek and Latin authors. H. F. Müller, the latest editor of Plotinus, has returned to the original arrangement by Enneads. His edition is accompanied by a very useful German translation, only half of which, however, has as yet appeared. (Berlin, 1878.)
[419] Zeller, Ph. d. Gr., III., b, p. 472. (Third edition.)
[420] Porph., Vita, iv. ff., xxiv. ff.
[421] Ibid., cap. x.
[422] Ibid.
[423] Ibid., cap. xxii.
[424] Ibid., capp. i. and ii.