Note 43 — Chapter IX · TOPICA. I.
Reading edition
Topic. I. xiii. p. 105, a. 21: τὰ δ’ ὄργανα, δι’ ὧν εὐπορήσομεν τῶν συλλογισμῶν, ἐστὶ τέτταρα, ἕν μὲν τὸ προτάσεις λαβεῖν, δεύτερον δὲ ποσαχῶς ἕκαστον λέγεται δύνασθαι διελεῖν, τρίτον τὰς διαφορὰς εὑρεῖν, τέταρτον δὲ ἡ τοῦ ὁμοίου σκέψις.
The term ὄργανα, properly signifying instruments, appears here by a strained metaphor. It means simply helps or aids, as may be seen by comparing Top. VIII. xiv. p. 163, b. 9. Waitz says truly (Prolegg. ad Analyt. Post. p. 294): “unde fit, ut ὄργανα dicat quæcunque ad aliquam rem faciendam adiumentum afferant.”