Michelet, in his Commentary on the Nikomachean Ethica, advances a theory somewhat analogous but bolder, respecting the relation between the Catalogue given by Diogenes, and the works contained in _our_ Aristotle. Comm. p. 2. "Id solum addam, hoc Aristotelis opus (the Nikomachean Ethica), ut reliqua omnia, ex brevioribus commentationibus consarcinatum fuisse, quæ quidem vivo Aristotele in lucem prodierint, cum unaquæque disciplina, e quâ excerpta fuerint in admirabilem illum quem habemus ordinem jam ab ipso Aristotele sive quodam ejus discipulo redacta, in libris Aristotelis manu scriptis latitaverit, qui hereditate ad Nelei prolem, ut notum est, transmissi, in cellâ illâ subterraneâ Scepsiâ absconditi fuerunt, donec Apellicon Teius et Rhodius Andronicus eos ediderint. Leguntur autem commentationum illarum de Moribus tituli in elencho librorum Aristotelis apud Diogenem (v. 22-26): [Greek: peri\ a)retô=n] (Lib. ii., iii. c. 6-fin. iv. nostrorum Ethicorum); [Greek: peri\ e(kousi/ou] (Lib. iii. c. 1-5); &c. Plerumque enim non integra volumina, sed singulos libros vel singula volumina diversarum disciplinarum, Diogenes in elencho suo enumeravit." In his other work (Essai sur la Métaphysique d'Aristote, pp. 202, 205, 225) Michelet has carried this theory still farther, and has endeavoured to identify separate fragments of the Aristotelian works now extant, with various titles in the Catalogue given by Diogenes. The identification is not convincing.] But though the edition published by Andronikus would thus contain many genuine works of Aristotle not previously known or edited, we cannot be sure that it would not also include some which were spurious. Reflect what the library of Apellikon, transported to Rome by Sylla, really was. There was in it the entire library of Theophrastus; probably, also, that of Neleus, who must have had some books of his own, besides what he inherited from Theophrastus. It included all the numerous manuscript works composed by Aristotle and Theophrastus, and many other manuscript works purchased or acquired by them, but composed by others--the whole in very bad order and condition; and, moreover, the books which Apellikon possessed before, doubtless as many Aristotelian books as he could purchase. To distinguish, among this heterogeneous mass of manuscripts, which of them were the manuscripts composed by Aristotle; to separate these from the writings of Theophrastus, Eudêmus, or other authors, who composed various works of their own upon the same subjects and with the same titles as those of Aristotle--required extreme critical discernment and caution; the rather, since there was no living companion of Aristotle or Theophrastus to guide or advise, more than a century and a half having elapsed since the death of Theophrastus, and two centuries since that of Aristotle. Such were the difficulties amidst which Apellikon, Tyrannion, and Andronikus had to decide, when