We have another distinct enumeration of the titles of Aristotle's works, prepared by an anonymous biographer cited in the notes of Ménage to Diogenes Laertius.[5] This anonymous list contains only one hundred and twenty-seven titles, being nineteen less than the list in Diogenes. The greater number of titles are the same in both; but Anonymus has eight titles which are not found in Diogenes, while Diogenes has twenty-seven titles which are not given by Anonymus. There are therefore thirty-five titles which rest on the evidence of one alone out of the two lists. Anonymus does not specify any total number of lines; nevertheless he gives the total number of _books_ composed by Aristotle as being nearly four hundred--the same as Diogenes. This total number cannot be elicited out of the items enumerated by Anonymus; but it may be made to coincide pretty nearly with the items in Diogenes,[6] provided we understand by _books_, sections or subdivisions of one and the same title or work. [Footnote 5: Ménage ad Diog. tom. ii. p. 201. See the very instructive treatise of Professor Heitz, Die Verlorenen Schriften des Aristoteles, p. 15 (Leipzig, 1865).] [Footnote 6: Heitz, Die Verl. Schrift. des Aristot. p. 51. Such coincidence assumes that we reckon the [Greek: Politei=ai] and the Epistles each as one book. I think it unnecessary to transcribe these catalogues of the titles of works mostly lost. The reader will find them clearly printed in the learned work of Val. Rose, Aristoteles Pseudepigraphus, pp. 12-20.] The two catalogues just mentioned, agreeing as they do in the total number of books and in the greater part of the items, may probably be considered not as original and copy, but as inaccurate transcripts from the same original authority. Yet neither of the two transcribers tells us what that original authority was. We may, however, be certain that each of them considered his catalogue to comprehend all that Aristotle could be affirmed on good authority to have published; Diogenes plainly signifies thus much, when he gives not only the total number of books, but the total number of lines. Such being the case, we expect to find in it, of course, the titles of the forty-six works composing the Berlin edition of Aristotle now before us. But this expectation is disappointed. The far greater number of the Aristotelian works which we now peruse are not specified either in the list of Diogenes, or in that of Anonymus.[7] Moreover, the lists also fail to specify the titles of various works which are not now extant, but which we know from Aristotle himself that he really composed.[8]