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The philosophical works of Themistius must have been very voluminous; for Photius tells us that he wrote commentaries on all the books of Aristotle, besides useful abstracts of the "Posterior Analytics", the books "On the Soul", and the "Physics", and that there were works of his on Plato; "and, in a word, he is a lover and eager student of philosophy." The Suda mentions his epitome of the "Physics" of Aristotle, in eight books; of the "Prior Analytics", in two books; of the "Posterior Analytics", in two books; of the treatise "On the Soul", in seven books; and of the "Categories" in one book.