§4.29.1δοκέει δέ μοι καὶ τὸ γένος τῶν βοῶν τὸ κόλον διὰ ταῦτα οὐ φύειν κέρεα αὐτόθι· μαρτυρέει δέ μοι τῇ γνώμῃ καὶ Ὁμήρου ἔπος ἐν Ὀδυσσείῃ ἔχον ὧδε,
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καὶ Λιβύην, ὅθι τʼ ἄρνες ἄφαρ κεραοὶ τελέθουσι,
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ὀρθῶς εἰρημένον, ἐν τοῖσι θερμοῖσι ταχὺ παραγίνεσθαι τὰ κέρεα, ἐν δὲ τοῖσι ἰσχυροῖσι ψύχεσι ἢ οὐ φύειν κέρεα τὰ κτήνεα ἀρχὴν ἡ φύοντα φύειν μόγις.
It seems to me that the hornless breed of cattle also does not grow horns there for this reason; and my opinion is also supported by a line of Homer in the Odyssey, which runs thus: "and Libya, where lambs quickly become horned, "this being rightly said, namely that in warm climates horns grow quickly, whereas in severe cold, beasts either do not grow horns at all, or, if they do grow them, they grow them with difficulty.