I shall assume this variety, both of subject and of handling, as a feature to be admitted and allowed for in Aristotle, when I come to discuss the objections of some critics against the authenticity of certain treatises among the forty-six which now pass under his name. But in canvassing the Aristotelian Canon I am unable to take the same ground as I took in my former work, when reviewing the Platonic Canon. In regard to Plato, I pointed out a strong antecedent presumption in favour of the Canon of Thrasyllus--a canon derived originally from the Alexandrine librarians, and sustained by the unanimous adhesion of antiquity. In regard to Aristotle, there are no similar grounds of presumption to stand upon. We have good reason for believing that the works both of Plato and Aristotle--if not all the works, at least many of them, and those the most generally interesting--were copied and transmitted early to the Alexandrine library. Now _our_ Plato represents that which was possessed and accredited as Platonic by the Byzantine Aristophanes and the other Alexandrine librarians; but _our_ Aristotle does not, in my judgment, represent what these librarians possessed and accredited as Aristotelian. That which they thus accredited stands recorded in the Catalogue given by Diogenes, probably the work of Hermippus, as I have already stated; while _our_ Aristotle is traceable to the collection at Athens, including that of Apellikon, with that which he bought from the heirs of Neleus, and to the sifting, correction, and classification, applied thereto by able critics of the first century B.C. and subsequently; among whom Andronikus is best known. We may easily believe that the library of Apellikon contained various compositions of Aristotle, which had never been copied for the Alexandrine library--perhaps never prepared for publication at all, so that the task of arranging detached sections or morsels into a whole, with one separate title, still remained to be performed. This was most likely to be the case with abstruser speculations, like the component books of the Metaphysica, which Theophrastus may not have been forward to tender, and which the library might not be very eager to acquire, having already near four hundred other volumes by the same author. These reserved works would therefore remain in the library of Theophrastus, not copied and circulated (or at least circulated only to a few private philosophical brethren, such as Eudêmus), so that they never became fully published until the days of Apellikon.[35] [Footnote 35: The two Peripatetic Scholarchs at Athens, Straton and Lykon, who succeeded (after the death of Theophrastus and the transfer of his library to Skêpsis) in the conduct of the school, left at their decease collections of books, of which each disposes by his will (Diogen. L. v. 62; v. 73). The library of Apellikon, when sent by Sylla to Rome, contained probably many other Aristotelian MSS., besides those purchased from Skêpsis.