[1] Τοὺς ἐν Βυζαντίῳ φασὶν ἐχίνους αἰσθάνεσθαι ὅτε βόρεια καὶ νότια πνεῖ πνεύματα, καὶ μεταβάλλειν εὐθὺς τὰς ὀπάς, καὶ ὅταν μὲν ᾖ νότια, ἐκ τοῦ ἐδάφους τὰς ὀπὰς ποιεῖσθαι, ὅταν δὲ βόρεια, ἐκ τῶν τοιχῶν.
Mirabilium auscultationes. Aristotle. ed. Immanuel Bekker. Oxford. 1837.
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