declared that the Academics could not be held to be philosophers if they had not even confidence in their one dogma (29). §19. _Sensibus_: it is important to observe that the word _sensus_ like αισθησις means two things, (1) one of the _five_ senses, (2) an individual act of sensation. _Deus_: for the supposed god cf. _T.D._ II. 67. _Non videam_: this strong statement is ridiculed in 80. _De remo inflexo et de collo columbae_: cf. 79, 82. The κωπη εναλος κεκλασμενη and περιστερας τραχηλος are frequently mentioned, along with numerous other instances of the deceptiveness of sense, by Sext. Emp., e.g. _Pyrrhon. Hypot._ I. 119-121, _Adv. Math._ VII. 244, 414. Cicero, in his speech of the day before, had probably added other examples, cf. Aug. _Cont. Ac._ III. 27. _Epicurus hoc viderit_: see 79, 80. Epic. held all sensation, _per se_, to be infallible. The chief authorities for this are given in R. and P. 343, 344, Zeller 403, footnote. _Lumen mutari_: cf. _Brut._ 261. _Intervalla ... diducimus_: for this cf. Sext. _Pyrrh_. I. 118 πεμπτος εστι λογος (i.e. the 5th sceptic τροπος for showing sense to be untrustworthy) ‛ο παρα τας θεσεις (_situs_) και τα διαστηματα (_intervalla_) και τους τοπους. _Multaque facimus usque eo_: Sext. _Adv. Math._ VII. 258 παντα ποιει μεχρις αν τρανην και πληκτικην σπαση φαντασιαν. _Sui iudicii_: see for the gen. _M.D.F._ II. 27; there is an extraordinary instance in Plaut. _Persa_ V. 2, 8, quoted by Goer. _Sui cuiusque_: for this use of _suus quisque_ as a single word see _M.D.F._ V. 46. §20. _Ut oculi ... cantibus_: Halm after Dav. treats this as a gloss: on the other hand I think it appropriate and almost necessary. _Quis est quin cernat_: read Madvig's strong remarks on Goerenz's note here (_D.F._ II. 27). _Umbris ... eminentia_: Pliny (see Forc.) often uses _umbra_ and _lumen_, to denote background and foreground, so in Gk. σκια and σκιασμα are opposed to λαμπρα; cf. also σκιαγραφειν, _adumbrare_, and Aesch. _Agam_. 1328. Cic. often applies metaphorically to oratory the two words here used, e.g. _De Or._ III. 101, and after him Quintilian, e.g. II. 17, 21. _Inflatu_: cf. 86 (where an answer is given) and αναβολη. _Antiopam_: of Pacuvius. _Andromacham_: of Ennius, often quoted by Cic., as _De Div._ I. 23. _Interiorem_: see R. and P. 165 and Zeller's _Socrates and the Socratic Schools_, 296. _Quia sentiatur_: αισθησις being their only κριτηριον. Madv. (without necessity, as a study of the passages referred to in R. and P. and Zeller will show) conj. _cui adsentiatur_, comparing 39, 58; cf. also 76. _Inter eum ... et inter_: for the repetition of _inter_ cf. _T.D._ IV. 32 and Madv. _Gram._ 470. _Nihil interesse_: if the doctrine of the Academics were true, a man might really be in pain when he fancied himself in pleasure, and _vice versa_; thus the distinction between pleasure and pain would be obscured. _Sentiet ... insaniat_: For the sequence cf. _D.F._ I. 62 and Wesenberg's fine note on _T.D._ V. 102.