# Περὶ Πυρετῶν [Sp.] 31.1-3

Alexander of Aphrodisias, Περὶ Πυρετῶν [Sp.], 31.1 to 31.3. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/alexander-of-aphrodisias/sp/31.1

Διαφορὰ τοίνυν πυρετῶν ἡ μὲν οὐσιώδης, ἡ δ᾽ ἐπουσιώδης· καὶ οὐσιώδης μὲν ἡ ἐκ τῆς οὐσίας αὐτῆς τῶν πυρετῶν γινομένη, ἐπουσιώδης δὲ ἡ ἐκ τῶν ἐπισυμβαινόντων τῇ οὐσίᾳ τῶν αὐτῶν, προσεχῶς τε καὶ πόρρω αμβανομένη. Οὐσία μὲν γὰρ πυρετῶν ἡ παρὰ φύσιν θερμότης, καθάπερ εἴρηται· ἡ γὰρ οὐσία τούτων τὸ μᾶλλον ἐπιδέχεται καὶ τὸ ἧττον· ἔστι δὲ καὶ ἐν ὑποκειμένῳ συμβεβηκός τι οὖσα, καὶ μὴ δυναμένη καθ᾽ αὑτὴν εἶναι ἢ καὶ ἐν τῷ ποιητικῷ ταύτης· αἰτίῳ. Πρὸς δὲ καὶ τρόπον ἔχει κινήσεως τῇ τοῦ, ἐν ᾧ ἐστι, φύσει τε καὶ ποιότητι, εἴθ᾽ ὑποκείμενον, εἴτε αἴτιον εἴη. Ἔι δὲ καὶ συμπτώματά τινα ἀπεργάζεται.

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Alexander of Aphrodisias, Περὶ Πυρετῶν [Sp.], ed. Julius Ludwig Ideler. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg0732.tlg003.local001/.