The Arabic text of Boethus fr. 44 Rashed has, pace Rashed (p. 266), a parallel in a Greek scholium to Galen's De elementis ex Hippocratis sententia. The scholium occurs in the sets of scholia to De elem. in Paris BNF suppl. gr. 634 (= Π; saec. xii) and in El Escorial Φ.II.15 (= Σ; saec. xiii). The former set was edited by G. Helmreich in Handschriftliche Studien zu Galen, vol. I. The relevant passage occurs in Π fol. 21 r ult. – v 3 (= schol. 34 p. 12 Helmr.) and in Σ fol. 136 r 7-11. The polysyllogism ascribed to Boethus reads:
τὸ ὅμοιον ὑπὸ τοῦ ὁμοίου γινώσκεται. ἡ αἴσθησις τὰ στοιχεῖα γινώσκει. ἡ αἴσθησις ἄρα ὁμοία τοῖς στοιχείοις … ἡ αἴσθησις ὁμοία τοῖς στοιχείοις. τὸ ὅμοιον ἐκ τοῦ ὁμοίου [γινώσκεται]. ἡ αἴσθησις ἄρα ἐκ τῶν στοιχείων [γινώσκεται].
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