WHEN Socrates was sixty years old, Plato, then a youth of twenty, came to him as a pupil. When Plato was sixty years old, the seventeen-year-old Aristotle presented himself, joining the Teacher's group of "Friends," as the members of the Academy called themselves. Aristotle was a youth of gentle birth and breeding, his father occupying the position of physician to King Philip of Macedon. Possessed of a strong character, a penetrating intellect, apparent sincerity, but great personal ambition. Aristotle was a student in the Academy during the twenty years he remained in Athens. His remarkab…