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Section 299
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οἷον τροχοῦ περιαγομένου γίγνεται διὰ τὸ κενὸν μηδὲν εἶναι. διὸ δὴ τὸ τῶν στηθῶν καὶ τὸ τοῦ πλεύμονος ἔξω μεθιὲν τὸ πνεῦμα πάλιν ὑπὸ τοῦ περὶ τὸ σῶμα ἀέρος, εἴσω διὰ μανῶν τῶν σαρκῶν δυομένου καὶ περιελαυνομένου, γίγνεται πλῆρες· αὖθις δὲ ἀποτρεπόμενος ὁ ἀὴρ καὶ διὰ τοῦ σώματος ἔξω ἰὼν εἴσω τὴν ἀναπνοὴν περιωθεῖ κατὰ τὴν τοῦ στόματος καὶ τὴν τῶν μυκτήρων δίοδον. τὴν δʼ αἰτίαν τῆς ἀρχῆς αὐτῶν θετέον