The following has been excerpted from Aristotle's Poetics. Included are Parts IV to XIII. Use this table to move to the sections of the Poetics you wish to read.

IV V VI VIII IX X XI XII XIII

Poetics

by Aristotle

Written ca. 350 B.C. Translated by S. H. Butcher

Part IV

Poetry in general seems to have sprung from two causes, each of
     them lying deep in our nature. First, the instinct of imitation is
     implanted in man from childhood, one difference between him and
     other animals being that he is the most imitative of living
     creatures, and through imitation learns his earliest lessons; and
     no less universal is the pleasure felt in things imitated. We have
     evidence of this in the facts of experience. Objects which in
     themselves we view with pain, we delight to contemplate when
     reproduced with minute fidelity: such as the forms of the most
     ignoble animals and of dead bodies. The cause of this again is,
     that to learn gives the liveliest pleasure, not only to
     philosophers but to men in general; whose capacity, however, of
     learning is more limited. Thus the reason why men enjoy seeing a
     likeness is, that in contemplating it they find themselves
     learning or inferring, and saying perhaps, 'Ah, that is he.' For
     if you happen not to have seen the original, the pleasure will be
     due not to the imitation as such, but to the execution, the
     coloring, or some such other cause.

     Imitation, then, is one instinct of our nature. Next, there is the
     instinct for 'harmony' and rhythm, meters being manifestly
     sections of rhythm. Persons, therefore, starting with this natural
     gift developed by degrees their special aptitudes, till their rude
     improvisations gave birth to Poetry.

     Poetry now diverged in two directions, according to the individual
     character of the writers. The graver spirits imitated noble
     actions, and the actions of good men. The more trivial sort
     imitated the actions of meaner persons, at first composing
     satires, as the former did hymns to the gods and the praises of
     famous men. A poem of the satirical kind cannot indeed be put down
     to any author earlier than Homer; though many such writers
     probably there were. But from Homer onward, instances can be
     cited- his own Margites, for example, and other similar
     compositions. The appropriate meter was also here introduced;
     hence the measure is still called the iambic or lampooning
     measure, being that in which people lampooned one another. Thus
     the older poets were distinguished as writers of heroic or of
     lampooning verse.

     As, in the serious style, Homer is pre-eminent among poets, for he
     alone combined dramatic form with excellence of imitation so he
     too first laid down the main lines of comedy, by dramatizing the
     ludicrous instead of writing personal satire. His Margites bears
     the same relation to comedy that the Iliad and Odyssey do to
     tragedy. But when Tragedy and Comedy came to light, the two
     classes of poets still followed their natural bent: the lampooners
     became writers of Comedy, and the Epic poets were succeeded by
     Tragedians, since the drama was a larger and higher form of art.

     Whether Tragedy has as yet perfected its proper types or not; and
     whether it is to be judged in itself, or in relation also to the
     audience- this raises another question. Be that as it may,
     Tragedy- as also Comedy- was at first mere improvisation. The one
     originated with the authors of the Dithyramb, the other with those
     of the phallic songs, which are still in use in many of our
     cities. Tragedy advanced by slow degrees; each new element that
     showed itself was in turn developed. Having passed through many
     changes, it found its natural form, and there it stopped.

     Aeschylus first introduced a second actor; he diminished the
     importance of the Chorus, and assigned the leading part to the
     dialogue. Sophocles raised the number of actors to three, and
     added scene-painting. Moreover, it was not till late that the
     short plot was discarded for one of greater compass, and the
     grotesque diction of the earlier satyric form for the stately
     manner of Tragedy. The iambic measure then replaced the trochaic
     tetrameter, which was originally employed when the poetry was of
     the satyric order, and had greater with dancing. Once dialogue had
     come in, Nature herself discovered the appropriate measure. For
     the iambic is, of all measures, the most colloquial we see it in
     the fact that conversational speech runs into iambic lines more
     frequently than into any other kind of verse; rarely into
     hexameters, and only when we drop the colloquial intonation. The
     additions to the number of 'episodes' or acts, and the other
     accessories of which tradition tells, must be taken as already
     described; for to discuss them in detail would, doubtless, be a
     large undertaking. 

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Part V

Comedy is, as we have said, an imitation of characters of a lower
     type- not, however, in the full sense of the word bad, the
     ludicrous being merely a subdivision of the ugly. It consists in
     some defect or ugliness which is not painful or destructive. To
     take an obvious example, the comic mask is ugly and distorted, but
     does not imply pain.

     The successive changes through which Tragedy passed, and the
     authors of these changes, are well known, whereas Comedy has had
     no history, because it was not at first treated seriously. It was
     late before the Archon granted a comic chorus to a poet; the
     performers were till then voluntary. Comedy had already taken
     definite shape when comic poets, distinctively so called, are
     heard of. Who furnished it with masks, or prologues, or increased
     the number of actors- these and other similar details remain
     unknown. As for the plot, it came originally from Sicily; but of
     Athenian writers Crates was the first who abandoning the 'iambic'
     or lampooning form, generalized his themes and plots.

     Epic poetry agrees with Tragedy in so far as it is an imitation in
     verse of characters of a higher type. They differ in that Epic
     poetry admits but one kind of meter and is narrative in form. They
     differ, again, in their length: for Tragedy endeavors, as far as
     possible, to confine itself to a single revolution of the sun, or
     but slightly to exceed this limit, whereas the Epic action has no
     limits of time. This, then, is a second point of difference;
     though at first the same freedom was admitted in Tragedy as in
     Epic poetry.

     Of their constituent parts some are common to both, some peculiar
     to Tragedy: whoever, therefore knows what is good or bad Tragedy,
     knows also about Epic poetry. All the elements of an Epic poem are
     found in Tragedy, but the elements of a Tragedy are not all found
     in the Epic poem. 

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Part VI

Of the poetry which imitates in hexameter verse, and of Comedy, we
     will speak hereafter. Let us now discuss Tragedy, resuming its
     formal definition, as resulting from what has been already said.

     Tragedy, then, is an imitation of an action that is serious,
     complete, and of a certain magnitude; in language embellished with
     each kind of artistic ornament, the several kinds being found in
     separate parts of the play; in the form of action, not of
     narrative; through pity and fear effecting the proper purgation of
     these emotions. By 'language embellished,' I mean language into
     which rhythm, 'harmony' and song enter. By 'the several kinds in
     separate parts,' I mean, that some parts are rendered through the
     medium of verse alone, others again with the aid of song.

     Now as tragic imitation implies persons acting, it necessarily
     follows in the first place, that Spectacular equipment will be a
     part of Tragedy. Next, Song and Diction, for these are the media
     of imitation. By 'Diction' I mean the mere metrical arrangement of
     the words: as for 'Song,' it is a term whose sense every one
     understands.

     Again, Tragedy is the imitation of an action; and an action
     implies personal agents, who necessarily possess certain
     distinctive qualities both of character and thought; for it is by
     these that we qualify actions themselves, and these- thought and
     character- are the two natural causes from which actions spring,
     and on actions again all success or failure depends. Hence, the
     Plot is the imitation of the action- for by plot I here mean the
     arrangement of the incidents. By Character I mean that in virtue
     of which we ascribe certain qualities to the agents. Thought is
     required wherever a statement is proved, or, it may be, a general
     truth enunciated. Every Tragedy, therefore, must have six parts,
     which parts determine its quality- namely, Plot, Character,
     Diction, Thought, Spectacle, Song. Two of the parts constitute the
     medium of imitation, one the manner, and three the objects of
     imitation. And these complete the fist. These elements have been
     employed, we may say, by the poets to a man; in fact, every play
     contains Spectacular elements as well as Character, Plot, Diction,
     Song, and Thought.

     But most important of all is the structure of the incidents. For
     Tragedy is an imitation, not of men, but of an action and of life,
     and life consists in action, and its end is a mode of action, not
     a quality. Now character determines men's qualities, but it is by
     their actions that they are happy or the reverse. Dramatic action,
     therefore, is not with a view to the representation of character:
     character comes in as subsidiary to the actions. Hence the
     incidents and the plot are the end of a tragedy; and the end is
     the chief thing of all. Again, without action there cannot be a
     tragedy; there may be without character. The tragedies of most of
     our modern poets fail in the rendering of character; and of poets
     in general this is often true. It is the same in painting; and
     here lies the difference between Zeuxis and Polygnotus. Polygnotus
     delineates character well; the style of Zeuxis is devoid of
     ethical quality. Again, if you string together a set of speeches
     expressive of character, and well finished in point of diction and
     thought, you will not produce the essential tragic effect nearly
     so well as with a play which, however deficient in these respects,
     yet has a plot and artistically constructed incidents. Besides
     which, the most powerful elements of emotional interest in
     Tragedy- Peripeteia or Reversal of the Situation, and Recognition
     scenes- are parts of the plot. A further proof is, that novices in
     the art attain to finish of diction and precision of portraiture
     before they can construct the plot. It is the same with almost all
     the early poets.

     The plot, then, is the first principle, and, as it were, the soul
     of a tragedy; Character holds the second place. A similar fact is
     seen in painting. The most beautiful colors, laid on confusedly,
     will not give as much pleasure as the chalk outline of a portrait.
     Thus Tragedy is the imitation of an action, and of the agents
     mainly with a view to the action.

     Third in order is Thought- that is, the faculty of saying what is
     possible and pertinent in given circumstances. In the case of
     oratory, this is the function of the political art and of the art
     of rhetoric: and so indeed the older poets make their characters
     speak the language of civic life; the poets of our time, the
     language of the rhetoricians. Character is that which reveals
     moral purpose, showing what kind of things a man chooses or
     avoids. Speeches, therefore, which do not make this manifest, or
     in which the speaker does not choose or avoid anything whatever,
     are not expressive of character. Thought, on the other hand, is
     found where something is proved to be or not to be, or a general
     maxim is enunciated.

     Fourth among the elements enumerated comes Diction; by which I
     mean, as has been already said, the expression of the meaning in
     words; and its essence is the same both in verse and prose.

     Of the remaining elements Song holds the chief place among the
     embellishments

     The Spectacle has, indeed, an emotional attraction of its own,
     but, of all the parts, it is the least artistic, and connected
     least with the art of poetry. For the power of Tragedy, we may be
     sure, is felt even apart from representation and actors. Besides,
     the production of spectacular effects depends more on the art of
     the stage machinist than on that of the poet. 

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Part VIII

Unity of plot does not, as some persons think, consist in the
     unity of the hero. For infinitely various are the incidents in one
     man's life which cannot be reduced to unity; and so, too, there
     are many actions of one man out of which we cannot make one
     action. Hence the error, as it appears, of all poets who have
     composed a Heracleid, a Theseid, or other poems of the kind. They
     imagine that as Heracles was one man, the story of Heracles must
     also be a unity. But Homer, as in all else he is of surpassing
     merit, here too- whether from art or natural genius- seems to have
     happily discerned the truth. In composing the Odyssey he did not
     include all the adventures of Odysseus- such as his wound on
     Parnassus, or his feigned madness at the mustering of the host-
     incidents between which there was no necessary or probable
     connection: but he made the Odyssey, and likewise the Iliad, to
     center round an action that in our sense of the word is one. As
     therefore, in the other imitative arts, the imitation is one when
     the object imitated is one, so the plot, being an imitation of an
     action, must imitate one action and that a whole, the structural
     union of the parts being such that, if any one of them is
     displaced or removed, the whole will be disjointed and disturbed.
     For a thing whose presence or absence makes no visible difference,
     is not an organic part of the whole. 

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Part IX

It is, moreover, evident from what has been said, that it is not
     the function of the poet to relate what has happened, but what may
     happen- what is possible according to the law of probability or
     necessity. The poet and the historian differ not by writing in
     verse or in prose. The work of Herodotus might be put into verse,
     and it would still be a species of history, with meter no less
     than without it. The true difference is that one relates what has
     happened, the other what may happen. Poetry, therefore, is a more
     philosophical and a higher thing than history: for poetry tends to
     express the universal, history the particular. By the universal I
     mean how a person of a certain type on occasion speak or act,
     according to the law of probability or necessity; and it is this
     universality at which poetry aims in the names she attaches to the
     personages. The particular is- for example- what Alcibiades did or
     suffered. In Comedy this is already apparent: for here the poet
     first constructs the plot on the lines of probability, and then
     inserts characteristic names- unlike the lampooners who write
     about particular individuals. But tragedians still keep to real
     names, the reason being that what is possible is credible: what
     has not happened we do not at once feel sure to be possible; but
     what has happened is manifestly possible: otherwise it would not
     have happened. Still there are even some tragedies in which there
     are only one or two well-known names, the rest being fictitious.
     In others, none are well known- as in Agathon's Antheus, where
     incidents and names alike are fictitious, and yet they give none
     the less pleasure. We must not, therefore, at all costs keep to
     the received legends, which are the usual subjects of Tragedy.
     Indeed, it would be absurd to attempt it; for even subjects that
     are known are known only to a few, and yet give pleasure to all.
     It clearly follows that the poet or 'maker' should be the maker of
     plots rather than of verses; since he is a poet because he
     imitates, and what he imitates are actions. And even if he chances
     to take a historical subject, he is none the less a poet; for
     there is no reason why some events that have actually happened
     should not conform to the law of the probable and possible, and in
     virtue of that quality in them he is their poet or maker.

     Of all plots and actions the episodic are the worst. I call a plot
     'episodic' in which the episodes or acts succeed one another
     without probable or necessary sequence. Bad poets compose such
     pieces by their own fault, good poets, to please the players; for,
     as they write show pieces for competition, they stretch the plot
     beyond its capacity, and are often forced to break the natural
     continuity.

     But again, Tragedy is an imitation not only of a complete action,
     but of events inspiring fear or pity. Such an effect is best
     produced when the events come on us by surprise; and the effect is
     heightened when, at the same time, they follows as cause and
     effect. The tragic wonder will then be greater than if they
     happened of themselves or by accident; for even coincidences are
     most striking when they have an air of design. We may instance the
     statue of Mitys at Argos, which fell upon his murderer while he
     was a spectator at a festival, and killed him. Such events seem
     not to be due to mere chance. Plots, therefore, constructed on
     these principles are necessarily the best. 

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Part X

Plots are either Simple or Complex, for the actions in real life,
     of which the plots are an imitation, obviously show a similar
     distinction. An action which is one and continuous in the sense
     above defined, I call Simple, when the change of fortune takes
     place without Reversal of the Situation and without Recognition

     A Complex action is one in which the change is accompanied by such
     Reversal, or by Recognition, or by both. These last should arise
     from the internal structure of the plot, so that what follows
     should be the necessary or probable result of the preceding
     action. It makes all the difference whether any given event is a
     case of propter hoc or post hoc. 

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Part XI

Reversal of the Situation is a change by which the action veers
     round to its opposite, subject always to our rule of probability
     or necessity. Thus in the Oedipus, the messenger comes to cheer
     Oedipus and free him from his alarms about his mother, but by
     revealing who he is, he produces the opposite effect. Again in the
     Lynceus, Lynceus is being led away to his death, and Danaus goes
     with him, meaning to slay him; but the outcome of the preceding
     incidents is that Danaus is killed and Lynceus saved.

     Recognition, as the name indicates, is a change from ignorance to
     knowledge, producing love or hate between the persons destined by
     the poet for good or bad fortune. The best form of recognition is
     coincident with a Reversal of the Situation, as in the Oedipus.
     There are indeed other forms. Even inanimate things of the most
     trivial kind may in a sense be objects of recognition. Again, we
     may recognize or discover whether a person has done a thing or
     not. But the recognition which is most intimately connected with
     the plot and action is, as we have said, the recognition of
     persons. This recognition, combined with Reversal, will produce
     either pity or fear; and actions producing these effects are those
     which, by our definition, Tragedy represents. Moreover, it is upon
     such situations that the issues of good or bad fortune will
     depend. Recognition, then, being between persons, it may happen
     that one person only is recognized by the other- when the latter
     is already known- or it may be necessary that the recognition
     should be on both sides. Thus Iphigenia is revealed to Orestes by
     the sending of the letter; but another act of recognition is
     required to make Orestes known to Iphigenia.

     Two parts, then, of the Plot- Reversal of the Situation and
     Recognition- turn upon surprises. A third part is the Scene of
     Suffering. The Scene of Suffering is a destructive or painful
     action, such as death on the stage, bodily agony, wounds, and the
     like. 

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Part XII

The parts of Tragedy which must be treated as elements of the
     whole have been already mentioned. We now come to the quantitative
     parts- the separate parts into which Tragedy is divided- namely,
     Prologue, Episode, Exode, Choric song; this last being divided
     into Parode and Stasimon. These are common to all plays: peculiar
     to some are the songs of actors from the stage and the Commoi.

     The Prologue is that entire part of a tragedy which precedes the
     Parode of the Chorus. The Episode is that entire part of a tragedy
     which is between complete choric songs. The Exode is that entire
     part of a tragedy which has no choric song after it. Of the Choric
     part the Parode is the first undivided utterance of the Chorus:
     the Stasimon is a Choric ode without anapaests or trochaic
     tetrameters: the Commos is a joint lamentation of Chorus and
     actors. The parts of Tragedy which must be treated as elements of
     the whole have been already mentioned. The quantitative parts- the
     separate parts into which it is divided- are here enumerated. 

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Part XIII

As the sequel to what has already been said, we must proceed to
     consider what the poet should aim at, and what he should avoid, in
     constructing his plots; and by what means the specific effect of
     Tragedy will be produced.

     A perfect tragedy should, as we have seen, be arranged not on the
     simple but on the complex plan. It should, moreover, imitate
     actions which excite pity and fear, this being the distinctive
     mark of tragic imitation. It follows plainly, in the first place,
     that the change of fortune presented must not be the spectacle of
     a virtuous man brought from prosperity to adversity: for this
     moves neither pity nor fear; it merely shocks us. Nor, again, that
     of a bad man passing from adversity to prosperity: for nothing can
     be more alien to the spirit of Tragedy; it possesses no single
     tragic quality; it neither satisfies the moral sense nor calls
     forth pity or fear. Nor, again, should the downfall of the utter
     villain be exhibited. A plot of this kind would, doubtless,
     satisfy the moral sense, but it would inspire neither pity nor
     fear; for pity is aroused by unmerited misfortune, fear by the
     misfortune of a man like ourselves. Such an event, therefore, will
     be neither pitiful nor terrible. There remains, then, the
     character between these two extremes- that of a man who is not
     eminently good and just, yet whose misfortune is brought about not
     by vice or depravity, but by some error or frailty. He must be one
     who is highly renowned and prosperous- a personage like Oedipus,
     Thyestes, or other illustrious men of such families.

     A well-constructed plot should, therefore, be single in its issue,
     rather than double as some maintain. The change of fortune should
     be not from bad to good, but, reversely, from good to bad. It
     should come about as the result not of vice, but of some great
     error or frailty, in a character either such as we have described,
     or better rather than worse. The practice of the stage bears out
     our view. At first the poets recounted any legend that came in
     their way. Now, the best tragedies are founded on the story of a
     few houses- on the fortunes of Alcmaeon, Oedipus, Orestes,
     Meleager, Thyestes, Telephus, and those others who have done or
     suffered something terrible. A tragedy, then, to be perfect
     according to the rules of art should be of this construction.
     Hence they are in error who censure Euripides just because he
     follows this principle in his plays, many of which end unhappily.
     It is, as we have said, the right ending. The best proof is that
     on the stage and in dramatic competition, such plays, if well
     worked out, are the most tragic in effect; and Euripides, faulty
     though he may be in the general management of his subject, yet is
     felt to be the most tragic of the poets.

     In the second rank comes the kind of tragedy which some place
     first. Like the Odyssey, it has a double thread of plot, and also
     an opposite catastrophe for the good and for the bad. It is
     accounted the best because of the weakness of the spectators; for
     the poet is guided in what he writes by the wishes of his
     audience. The pleasure, however, thence derived is not the true
     tragic pleasure. It is proper rather to Comedy, where those who,
     in the piece, are the deadliest enemies- like Orestes and
     Aegisthus- quit the stage as friends at the close, and no one
     slays or is slain. 

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