§21. _Illud est album_: these are αξιωματα, judgments of the mind, in which alone truth and falsehood reside; see Zeller 107 sq. There is a passage in Sext. _Adv. Math._ VII. 344, 345 which closely resembles ours; it is too long to quote entire: αισθησεσι μεν ουν μοναις λαβειν ταληθες (which resides only in the αξιωμα) ου δυναται ανθρωπος. ... φυσει γαρ εισιν αλογοι ... δει δε εις φαντασιαν αχθηναι του τοιουτου πραγματος "τουτο λευκον εστι και τουτο γλυκυ εστιν." τωι δε τοιουτωι πραγματι ουκετι της αισθησεως εργον εστιν επιβαλλειν ... συνεσεως τε δει και μνημης. _Ille deinceps_: _deinceps_ is really out of place; cf. 24 _quomodo primum_ for _pr. quom._ _Ille equus est_: Cic. seems to consider that the αξιωμα, which affirms the existence of an abstract quality, is prior to that which affirms the existence of a concrete individual. I can quote no parallel to this from the Greek texts. _Expletam comprehensionem_: full knowledge. Here we rise to a definition. This one often appears in Sextus: e.g. _Adv. Math._ VII. ανθρωπος εστι ζωον λογικον θνητον, νου και επιστημης δεκτικον. The Stoic ‛οροι, and this among them, are amusingly ridiculed, _Pyrrh. Hyp._ II. 208--211. _Notitiae_: this Cic. uses as a translation both of προληψις and εννοια, for which see Zeller 79, 89. In I. 40 _notiones rerum_ is given. _Sine quibus_: δια γαρ των εννοιων τα πραγματα λαμβανεται Diog. VII. 42. §22. _Igitur_: for the anacoluthia cf. Madv. _Gram._ 480. _Consentaneum_: so Sextus constantly uses ακολουθον. _Repugnaret_: cf. I. 19 and n. _Memoriae certe_: n. on 106. _Continet_: cf. _contineant_ in 40. _Quae potest esse_: Cic. nearly always writes _putat esse_, _potest esse_ and the like, not _esse putat_ etc., which form is especially rare at the end of a clause. _Memoria falsorum_: this difficulty is discussed in Plato _Sophist._ 238--239. _Ex multis animi perceptionibus_: the same definition of an art occurs in _N.D._ II. 148, _D.F._ III. 18 (see Madv.), Quint, II. 17, 41, Sext. _Pyrrh. Hyp._ III. 188 τεχνην ειναι συστημα εκ καταληψεον συγγεγυμνασμενων _ib._ III. 250. _Quam_: for the change from plural to singular (_perceptio in universum_) cf. n. on I. 38, Madv. _D.F._ II. 61, _Em._ 139. _Qui distingues_: Sext. _Adv. Math._ VIII. 280 ου διοισει της ατεχνιας ‛η τεχνη. Sextus often comments on similar complaints of the Stoics. _Aliud eiusmodi genus sit_: this distinction is as old as Plato and Arist., and is of constant occurrence in the late philosophy. Cf. Sext. _Adv. Math._ XI. 197 who adds a third class of τεχναι called αποτελεσματικαι to the usual θεωρητικαι and πρακτικαι, also Quint. II. 18, 1 and 2, where ποιητικη corresponds to the αποτ. of Sext. _Continget_: "will be the natural consequence." The notion that the verb _contingit_ denotes necessarily _good_ fortune is quite unfounded; see Tischer on _T.D._ III. 4. _Tractabit_: μελλει μεταχειριζεσθαι.