A Peripety is the change from one state of things within
the play to its opposite of the kind described, and that too
in the way we are saying, in the probable or necessary
sequence of events;
as it is for instance in Oedipus: here
the opposite state of things is produced by the Messenger,
who, coming to gladden Oedipus and to remove his fears
as to his mother, reveals the secret of his birth.
And in
Lynceus: just as he is being led off for execution, with
Danaus at his side to put him to death, the incidents pre-
ceding this bring it about that he is saved and Danaus put
to death.
A Discovery is, as the very word implies, a change
from ignorance to knowledge, and thus to either love or hate,
in the personages marked for good or evil fortune.
The
finest form of Discovery is one attended by Peripeties, like
that which goes with the Discovery in Oedipus.
There are
no doubt other forms of it; what we have said may happen
in a way in reference to inanimate things, even things of
a very casual kind; and it is also possible to discover
whether some one has done or not done something.
But
the form most directly connected with the Plot and the
action of the piece is the first-mentioned. This, with a
Peripety, will arouse either pity or fear—actions of that
nature being what Tragedy is assumed to represent;
and it
will also serve to bring about the happy or unhappy
ending.
The Discovery, then, being of persons, it may be that of one
party only to the other, the latter being already known;
or
both the parties may have to discover themselves. Iphigenia,
for instance, was discovered to Orestes by sending the
letter; and another Discovery was required to reveal him
to Iphigenia.
Two parts of the Plot, then, Peripety and Discovery, are
on matters of this sort.
A third part is Suffering;
we may define as an action of a destructive or painful
nature, such as murders on the stage, tortures, woundings,
and the like.
Poetics. Aristotle. Ingram Bywater (Translator), ed. Gilbert Murray. Oxford. 1909.