are far more closely connected with the general development of
Scepticism, than the later ones. By the name [Greek: tropos] or
Trope, the Sceptic understood a manner of thought, or form of
argument, or standpoint of judgement. It was a term common in
Greek philosophy, used in this sense, from the time of
Aristotle.[1] The Stoics, however, used the word with a
different meaning from that attributed to it by the Sceptics.[2]
Stephanus and Fabricius translate it by the Latin word
_modus_[3] and [Greek: tropos] also is often used
interchangeably with the word [Greek: logos] by Sextus, Diogenes
Laertius, and others; sometimes also as synonymous with [Greek:
topos],[4] and [Greek: typos] is found in the oldest edition of
Sextus.[5] Diogenes defines the word as the standpoint, or
manner of argument, by which the Sceptics arrived at the
condition of doubt, in consequence of the equality of
probabilities, and he calls the Tropes, the ten Tropes of
doubt.[6] All writers on Pyrrhonism after the time of
Aenesidemus give the Tropes the principal place in their
treatment of the subject. Sextus occupies two thirds of the
first book of the _Hypotyposes_ in stating and discussing them;
and about one fourth of his presentation of Scepticism is
devoted to the Tropes by Diogenes. In addition to these two
authors, Aristocles the Peripatetic refers to them in his attack
on Scepticism.[7] Favorinus wrote a book entitled _Pyrrhonean
Tropes_, and Plutarch one called _The Ten ([Greek: topoi]) Topes
of Pyrrho_.[8] Both of these latter works are lost.

[1] Pappenheim _Erlauterung Pyrrh. Grundzugen_, p. 35.

[2] Diog I. 76; _Adv. Math._ VIII. 227.