26.16 περὶ μὲν οὖν τραγῳδίας καὶ ἐποποιίας , καὶ αὐτῶν καὶ τῶν εἰδῶν καὶ τῶν μερῶν αὐτῶν , καὶ πόσα καὶ τί διαφέρει , καὶ τοῦ εὖ μὴ τίνες αἰτίαι , καὶ περὶ ἐπιτιμήσεων καὶ λύσεων εἰρήσθω τοσαῦτα .