§42. _Proposita_: cf. προτασεις _passim_ in Sext. _In sensus_: = _in ea, quae ad sensus pertinent_ cf. I. 20. _Omni consuetudine_: "general experience" εμπειρια, cf. _N.D._ I. 83. _Quam obscurari volunt_: cf. I. 33. _quod explanari volebant_; the em. of Dav. _obscurare_ is against Cic.'s usage, that of Christ _quam observari nolunt_ is wanton without being ingenious. _De reliquis_: i.e. _iis quae a sensibus ducuntur_. _In singulisque rebus_: the word _rebus_ must mean _subjects_, not _things_, to which the words _in minima dispertiunt_ would hardly apply. _Adiuncta_: Sext. _A.M._ VII. 164 (R. and P. 410) πασηι τη δοκουσηι αληθει καθεσταναι ευρισκεται τις απαραλλακτος ψευδης, also VII. 438, etc. §§43--45. Summary. The sceptics ought not to _define_, for (1) a definition cannot be a definition of two things, (2) if the definition is applicable only to one thing, that thing must be capable of being thoroughly known and distinguished from others (43). For the purposes of reasoning their _probabile_ is not enough. Reasoning can only proceed upon _certain_ premisses. Again to say that there are false sensations is to say that there are true ones; you acknowledge therefore a difference, then you contradict yourselves and say there is none (44). Let us discuss the matter farther. The innate clearness of _visa_, aided by reason, can lead to knowledge (45). §43. _Horum_: Lamb. _harum_; the text however is quite right, cf. Madv. _Gram._ 214 b. _Luminibus_: cf. 101. _Nihilo magis_: = ουδεν μαλλον, which was constantly in the mouths of sceptics, see e.g. Sext. _P.H._ I. 14. _Num illa definitio ... transferri_: I need hardly point out that the ‛ορος of the Academics was merely founded on probability, just as their "truth" was (cf. n. on 29). An Academic would say in reply to the question, "probably it cannot, but I will not affirm it." _Vel illa vera_: these words seem to me genuine, though nearly all editors attack them. _Vel_ = "even" i.e. if _even_ the definition is firmly known, the thing, which is more important, must also be known. In _illa vera_ we have a pointed mocking repetition like that of _veri et falsi_ in 33. _In falsum_: note that _falsum_ = _aliam rem_ above. For the sense cf. Sext. _P.H._ II. 209 μοχθηρους ‛ορους ειναι τους περιεχοντας τι των μη προσοντων τοις ‛οριστοις, and the schoolmen's maxim _definitio non debet latior esse definito suo_. _Minime volunt_: cf. 18. _Partibus_: Orelli after Goer. ejected this, but _omnibus_ hardly ever stands for _omn. rebus_, therefore C.F. Hermann reads _pariter rebus_ for _partibus_. A little closer attention to the subject matter would have shown emendation to be unnecessary, cf. 42 _dividunt in partis_, _T.D._ III. 24, where _genus_ = division, _pars_ = subdivision.