_Hypotyposes_ could not have been delivered in Alexandria, as he
often refers to that place in comparison with the place where he
was then speaking. He says, furthermore, that he teaches in the
same place where his master taught.[1] [Greek: Blepon te hoti
entha ho huphaegaetaes ho emos dielegeto, entautha ego nun
dialegomai]. Therefore the school must have been removed from
Alexandria, in or before the time of the teacher of Sextus, to
some other centre. The _Hypotyposes_ are from beginning to end a
direct attack on the Dogmatics; therefore Sextus must have
taught either in some city where the dogmatic philosophy was
strong, or in some rival philosophical centre. The _Hypotyposes_
show also that the writer had access to some large library.
Alexandria, Rome and Athens are the three places the most
probable for selection for such a purpose. For whatever reason
the seat of the school was removed from Alexandria by the master
of Sextus, or by himself, from the place where it had so long
been united with the Empirical School of medicine, Athens would
seem the most suitable city for its recontinuance, in the land
where Pyrrhonism first had its birth. Sextus, however, in one
instance, in referring to things invisible because of their
outward relations, says in illustration, "as the city of Athens
is invisible to us at present."[2] In other places also he
contrasts the Athenians with the people whom he is addressing,
equally with the Alexandrians, thus putting Athens as well as
Alexandria out of the question.

[1] _Hyp._ III. 120.

[2] _Hyp._ II. 98.