[295] Sext. Emp., Pyrrh. Hyp., I., 180 ff.
[296] Adv. Math., IX., 228.
[297] The ten Tropes were evidently suggested by the ten Categories of Aristotle. The five grounded on differences of disposition, place, quantity, relation, and
habits, show at once by their names that they are derived from κεῖσθαι, ποῦ,
ποσόν, πρός τι, and ἔχειν. The Trope of comparative frequency would be suggested by πότε; the disturbing influence of bodies on one another combines ποιεῖν and πάσχειν; the conflict of the special senses belongs, although somewhat more remotely, to ποιόν; and, in order to make up the number ten, οὐσία, which answers to the percipient in general, had to be divided into the two Tropes taken respectively from the differences among animals and among men,—an arrangement that would occur all the more readily as οὐσία included the two notions of Genus and Species, of which the one answers, in this instance, to animals, and the other to men.
[298] Zeller, III., b, p. 23.
[299] Zeller, op. cit. pp. 29-37.
[300] Sext. Emp., Pyrrh. Hyp., I., 164 and 178; Zeller, op. cit., pp. 37 and 38.
[301] Adv. Math., V., 1.
[302] ibid., IX., 208.
[303] These are the four principles enumerated by Sextus, Pyrrh. Hyp., I., 24.
[304] Diog. L., X., 9.