After the death of Philip, Aristotle returned to Athens, and opened a school of philosophy on his own account in the Lyceum. Here some authorities tell us he lectured to his pupils while he paced up and down before them; hence the epithet applied to the school, the _Peripatetics_. Probably, however, the name is derived from the 'Peripati' or covered {175} walks in the neighbourhood of that temple in which he taught. He devoted his mornings to lectures of a more philosophical and technical character; to these only the abler and more advanced students were admitted. In the afternoons he lectured on subjects of a more popular kind--rhetoric, the art of politics, etc.--to larger audiences. Corresponding with this division, he also was in the habit of classifying his writings as Acroatic or technical, and Exoteric or popular. He accumulated a large library and museum, to which he contributed an astonishing number of works of his own, on every conceivable branch of knowledge. The after history of Aristotle's library, including the MSS. of his own works, is interesting and even romantic. Aristotle's successor in the school was Theophrastus, who added to the library bequeathed him by Aristotle many works of his own, and others purchased by him. Theophrastus bequeathed the entire library to Neleus, his friend and pupil, who, on leaving Athens to reside at Scepsis in the Troad, took the library with him. There it remained for nearly two hundred years in possession of the Neleus family, who kept the collection hidden in a cellar for fear it should be seized to increase the royal library of Pergamus. In such a situation the works suffered much harm from worms and damp, till at last (_circa_ 100 B.C.) they were brought out {176} and sold to one Apellicon, a rich gentleman resident in Athens, himself a member of the Peripatetic school. In 86 B.C. Sulla, the Roman dictator, besieged and captured Athens, and among other prizes conveyed the library of Apellicon to Rome, and thus many of the most important works of Aristotle for the first time were made known to the Roman and Alexandrian schools. It is a curious circumstance that the philosopher whose influence was destined to be paramount for more than a thousand years in the Christian era, was thus deprived by accident of his legitimate importance in the centuries immediately following his own.