This follows from a comparison of Diog. ii. 3. with Hipp. _Ref._ i. 7 (R. P. 23). In the latter passage we must, however, read τρίτον for πρῶτον with Diels. The suggestion in R. P. 23 e that Apollodoros mentioned the Olympiad without giving the number of the year is inadequate; for Apollodoros did not reckon by Olympiads, but Athenian archons. Jacoby (p. 194) brings the date of his death into connexion with the _floruit_ of Pythagoras, which seems to me less probable. Lortzing (_Jahresber._, 1898, p. 202) objects to my view on the ground that the period of a hundred years plays no part in Apollodoros’s calculations. It will be seen, however, from Jacoby, pp. 39 sqq., that there is some reason for believing he made use of the generation of 33⅓ years. [Sidenote: His book.] 24. Anaximenes wrote a book which certainly survived until the age of literary criticism; for we are told that he used a simple and unpretentious Ionic,[147] very different, we may suppose, from the poetical prose of Anaximander.[148] We may probably trust this criticism, which comes ultimately from Theophrastos; and it furnishes a good illustration of the truth that the character of a man’s thoughts is sure to find expression in his style. We have seen that the speculations of Anaximander were distinguished for their hardihood and breadth; those of Anaximenes are marked by just the opposite quality. He appears to have thought out his system carefully, but he rejects the more audacious theories of his predecessor. The result is that, while his view of the world is on the whole much less like the truth than Anaximander’s, it is more fruitful in ideas that were destined to hold their ground. Footnote 147: Diog. ii. 3 (R. P. 23). Footnote 148: Cf. the statement of Theophrastos above, § 13. [Sidenote: Theory of the primary substance.] 25. Anaximenes is one of the philosophers on whom Theophrastos wrote a special monograph;[149] and this gives us an additional guarantee for the trustworthiness of the tradition derived from his great work. The following[150] are the passages which seem to contain the fullest and most accurate account of what he had to say on the central feature of the system:— Anaximenes of Miletos, son of Eurystratos, who had been an associate of Anaximander, said, like him, that the underlying substance was one and infinite. He did not, however, say it was indeterminate, like Anaximander, but determinate; for he said it was Air.—_Phys. Op._ fr. 2 (R. P. 26). From it, he said, the things that are, and have been, and shall be, the gods and things divine, took their rise, while other things come from its offspring.—Hipp. _Ref._ i. 7 (R. P. 28). “Just as,” he said, “our soul, being air, holds us together, so do breath and air encompass the whole world.”—Aet. i. 3, 4 (R. P. 24).