But when these same particles, refined by putrefaction, enter into the narrow veins, and are duly proportioned to the particles of earth and air which are there, they set them whirling about one another, and while they are in a whirl cause them to dash against and enter into one another, and so form hollows surrounding the particles that enter-which watery vessels of air (for a film of moisture, sometimes earthy, sometimes pure, is spread around the air) are hollow spheres of water; and those of them which are pure, are transparent, and are called bubbles, while those composed of the earthy liquid, which is in a state of general agitation and effervescence, are said to boil or ferment-of all these affections the cause is termed acid. And there is the opposite affection arising from an opposite cause, when the mass of entering particles, immersed in the moisture of the mouth, is congenial to the tongue, and smooths and oils over the roughness, and relaxes the parts which are unnaturally contracted, and contracts the parts which are relaxed, and disposes them all according to their nature-that sort of remedy of violent affections is pleasant and agreeable to every man, and has the name sweet. But enough of this.

τὸ δὲ αὖ τῶν προλελεπτυσμένων μὲν ὑπὸ σηπεδόνος͵ εἰς δὲ τὰς στενὰς φλέβας ἐνδυομένων͵ καὶ τοῖς ἐνοῦσιν αὐτόθι μέρεσιν γεώδεσιν καὶ ὅσα ἀέρος συμμετρίαν ἔχοντα͵ ὥστε κινήσαντα περὶ ἄλληλα ποιεῖν κυκᾶσθαι͵ κυκώμενα δὲ περιπίπτειν τε καὶ εἰς ἕτερα ἐνδυόμενα ἕτερα κοῖλα ἀπεργάζεσθαι περιτεινόμενα τοῖς εἰσιοῦσιν 66b ἃ δὴ νοτίδος περὶ ἀέρα κοίλης περιταθείσης͵ τοτὲ μὲν γεώδους͵ τοτὲ δὲ καὶ καθαρᾶς͵ νοτερὰ ἀγγεῖα ἀέρος͵ ὕδατα κοῖλα περιφερῆ τε γενέσθαι͵ καὶ τὰ μὲν τῆς καθαρᾶς διαφανεῖς περιστῆναι κληθείσας ὄνομα πομφόλυγας͵ τὰ δὲ τῆς γεώδους ὁμοῦ κινουμένης τε καὶ αἰρομένης ζέσιν τε καὶ ζύμωσιν ἐπίκλην λεχθῆναι - τὸ δὲ τούτων αἴτιον τῶν παθημάτων ὀξὺ προσρηθῆναι. [66c] σύμπασιν δὲ τοῖς περὶ ταῦτα εἰρημένοις πάθος ἐναντίον ἀπ΄ ἐναντίας ἐστὶ προφάσεως· ὁπόταν ἡ τῶν εἰσιόντων σύστασις ἐν ὑγροῖς͵ οἰκεία τῇ τῆς γλώττης ἕξει πεφυκυῖα͵ λεαίνῃ μὲν ἐπαλείφουσα τὰ τραχυνθέντα͵ τὰ δὲ παρὰ φύσιν συνεστῶτα ἢ κεχυμένα τὰ μὲν συνάγῃ͵ τὰ δὲ χαλᾷ͵ καὶ πάνθ΄ ὅτι μάλιστα ἱδρύῃ κατὰ φύσιν͵ ἡδὺ καὶ προσφιλὲς παντὶ πᾶν τὸ τοιοῦτον ἴαμα τῶν βιαίων παθημάτων γιγνόμενον κέκληται γλυκύ. [66d] Καὶ τὰ μὲν ταύτῃ ταῦτα·