These principles being established, let us now discuss the proper
structure of the Plot, since this is the first and most important thing
in Tragedy.
Now, according to our definition, Tragedy is an imitation of an action
that is complete, and whole, and of a certain magnitude; for there may
be a whole that is wanting in magnitude. A whole is that which has a
beginning, a middle, and an end. A beginning is that which does not
itself follow anything by causal necessity, but after which something
naturally is or comes to be. An end, on the contrary, is that which
itself naturally follows some other thing, either by necessity, or as
a rule, but has nothing following it. A middle is that which follows
something as some other thing follows it. A well constructed plot,
therefore, must neither begin nor end at haphazard, but conform to these
principles.
Again, a beautiful object, whether it be a living organism or any whole
composed of parts, must not only have an orderly arrangement of parts,
but must also be of a certain magnitude; for beauty depends on magnitude
and order. Hence a very small animal organism cannot be beautiful;
for the view of it is confused, the object being seen in an almost
imperceptible moment of time. Nor, again, can one of vast size be
beautiful; for as the eye cannot take it all in at once, the unity and
sense of the whole is lost for the spectator; as for instance if there
were one a thousand miles long. As, therefore, in the case of animate
bodies and organisms a certain magnitude is necessary, and a magnitude
which may be easily embraced in one view; so in the plot, a certain
length is necessary, and a length which can be easily embraced by the
memory. The limit of length in relation to dramatic competition and
sensuous presentment, is no part of artistic theory. For had it been the
rule for a hundred tragedies to compete together, the performance would
have been regulated by the water-clock,--as indeed we are told was
formerly done. But the limit as fixed by the nature of the drama itself
is this: the greater the length, the more beautiful will the piece be
by reason of its size, provided that the whole be perspicuous. And
to define the matter roughly, we may say that the proper magnitude is
comprised within such limits, that the sequence of events, according
to the law of probability or necessity, will admit of a change from bad
fortune to good, or from good fortune to bad.