[108] Arnim ii 418; ‘e quibus [elementis] aer et ignis movendi vim habent et efficiendi; reliquae partes accipiendi et quasi patiendi, aquam dico et terram’ Cic. Ac. i 7, 26.
[109] κατὰ τοὺς Στωϊκούς, ἐκ τῆς τῶν τεσσάρων στοιχείων κράσεως γινομένου τοῦ σώματος Justin de res. 6 (Arnim ii 414).
[110] ὅσα τοίνυν σώματα πρῶτον τὰς τοιαύτας ἔχει ποιότητας, ἐκεῖνα στοιχεῖα τῶν ἄλλων ἁπάντων ἐστὶ καὶ τῆς σαρκός· ἔστι δὲ ταῦτα γῆ καὶ ὕδωρ καὶ ἀὴρ καὶ πῦρ Galen const. art. med. i p. 251 K (Arnim ii 405).
[111] Galen meth. med. i 2, X p. 15 K (Arnim ii 411).
[113] Cf. Mahaffy’s Greek Life and Thought; ‘it is quite wrong to suppose that these thinkers [Zeno and Epicurus], busy as they were with practical life, despised or avoided speculation. Their philosophical theories demand hard reading and hard thinking’ p. 137.
CHAPTER VIII.
THE UNIVERSE.
Study of the heavens.