This interesting narrative--delivered by Strabo, the junior contemporary of Andronikus, and probably derived by him either from Tyrannion his preceptor or from the Sidonian Boêthus[29] and other philosophical companions jointly, with whom he had prosecuted the study of Aristotle--appears fully worthy of trust. The proceedings both of Apellikon and of Sylla prove, what indeed we might have presumed without proof, that the recovery of these long-lost original manuscripts of Aristotle and Theophrastus excited great sensation in the philosophical world of Athens and of Rome. With such newly-acquired materials, a new epoch began for the study of these authors. The more abstruse philosophical works of Aristotle now came into the foreground under the auspices of a new Scholarch; whereas Aristotle had hitherto been chiefly known by his more popular and readable compositions. Of these last, probably, copies may have been acquired to a certain extent by the previous Peripatetic Scholarchs or School at Athens; but the School had been irreparably impoverished, so far as regarded the deeper speculations of philosophy, by the loss of those original manuscripts which had been transported from Athens to Skêpsis. What Aristotelian Scholarchs, prior to Andronikus, chiefly possessed and studied, of the productions of their illustrious founder, were chiefly the _exoteric_ or extra-philosophical and comparatively popular:--such as the dialogues; the legendary and historical collections; the facts respecting constitutional history of various Hellenic cities; the variety of miscellaneous problems respecting Homer and a number of diverse matters; the treatises on animals and on anatomy, &c.[30] In the Alexandrine library (as we see by the Catalogue of Diogenes) there existed all these and several philosophical works also; but that library was not easily available for the use of the Scholarchs at Athens, who worked upon their own stock, confining themselves mainly to smooth and elegant discourses on particular questions, and especially to discussions, with the Platonists, Stoics, and Epikureans, on the _principia_ of Ethics, without any attempt either to follow up or to elucidate the more profound speculations (logical, physical, metaphysical, cosmical) of Aristotle himself. A material change took place when the library of Apellikon came to be laid open and studied, not merely by lecturers in the professorial chair at Athens, but also by critics like Tyrannion and Andronikus at Rome. These critics found therein the most profound and difficult philosophical works of Aristotle in the handwriting of the philosopher himself; some probably, of which copies may have already existed in the Alexandrine library, but some also as yet unpublished. The purpose of Andronikus, who is described as Peripatetic Scholarch, eleventh in succession from Aristotle, was not simply to make a Catalogue (as Hermippus had made at Alexandria),