. Deor. i. 4; de Off. i. 1; de Fin.; init. Acad. Quaest.
init. etc.

[140] Tusc Quaest. i. 3; ii. 3; Acad. Quaest. i. 2; de Nat. Deor. i. 21;
de Fin. i. 3, etc.; de Clar. Orat. 35.

[141] Lucullus, 2; de Fin. i. 1-3; Tusc Quaest. ii. 1, 2; iii. 2; v. 2;
de Legg. i. 22-24; de Off. ii. 2; de Orat. 41, etc.

[142] Middleton's Life, vol. ii. p. 254.

[143] Ad Quinct. fratr. iii. 3.

[144] Tusc. Quaest, v. 2.

[145] De Off. i. 5. _init._

[146] Johnson's observations on Addison's writings may be well applied
to those of Cicero, who would have been eminently successful in short
miscellaneous essays, like those of the Spectator, had the manners of
the age allowed it.

[147] Orat iii. 4; Tusc. Quaest. ii. 3; de Off. i. 1. Paradox. _praefat._
Quinct. Instit. xii. 2.

[148] Article, Plato, in the Encyclopaedia Metropolitana.

[149] Acad. Quaest. i. 10, etc.; Lucullus, 5; de Legg. i. 20; iii. 3,
etc.

[150] Acad. Quaest. i. 4, 12, 13; Lucullus, 5 and 23; de Nat. Deor. i. 5;
de Fin. ii. 1; de Orat. iii. 18. Augustin. contra Acad. ii. 6. Plutarch,
in Colot. 26.

[151] "Arcesilas negabat esse quidquam, quod sciri posset, ne illud
quidem ipsum quod Socrates sibi reliquisset. Sic omnia latere censebat
in occulto, neque esse quicquam quod cerni, quod intelligi, posset;
quibus de causis nihil oportere neque profiteri neque affirmare
quenquam, neque assentione approbare, etc."--_Acad. Quaest._ i. 12. See
also Lucullus, 9 and 18. They were countenanced in these conclusions by
Plato's doctrine of ideas.--_Lucullus_, 46.

[152] Sext. Empir. Pyrrh. Hypot. i. 33. Diogenes Laertius, lib. iv. in
Arcesil. Vid. Lactant. Instit. iii. 6.

[153] Lucullus, 6.

[154] Augustin. contr. Acad. iii. 17.

[155] Lucullus, 18, 24. Augustin. contr. Acad. iii. 39.

[156] See Sext. Empir. adv. Log. i. 166., etc., p. 405.

[157] Acad. Quaest. i. 13; Lucullus, 23, 38; de Nat. Deor. i. 5; Orat.
71.

[158] "Tu autem te negas infracto remo neque columbae collo commoveri.
Primum cur? nam et in remo sentio non esse id quod videatur, et in
columba plures videri colores, nec esse plus uno, etc."--_Lucullus_, 25.

[159] Lucullus, 16-18; 26-28.

[160] "Vehementer errare eos qui dicant ab Academia sensus eripi; a
quibus nunquam dictum sit aut colorem aut saporem aut sonum nullum esse,
[sed] illud sit disputatum, non inesse in his propriam, quae nusquam
alibi esset, veri et certi notam."--_Lucullus_, 32. See also 13, 24, 31;
de Nat. Deor. i. 5.