δὲ χαλεπώτατον ἢ ἀδύνατον εἰς τὰ ἄναιμα. ἀναγκαῖον γὰρ τῶν καθʼ ἕκαστον ὑπάρχειν τινὶ τῶν διαφορῶν 1 ἑκάστην, ὥστε καὶ τὴν ἀντικειμένην.
De partibus animalium. Aristotle. ed. Bernhard Langkavel. United States. 2016.
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