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THE fable, however, is one, not as some suppose, if one person is the subject of it;
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for many things which are infinite in kind happen [to one man], from a certain number of which no one event arises. Thus, also, there are many actions of one man, from which no one action is produced.
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Hence all those poets appear to have erred who have written the Heracleid, and Theseid,
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and such like poems. For they suppose that because Hercules was one person, it was fit that the fable should be one.
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Homer, however, as he excelled in other things, appears likewise to have seen this clearly, whether from art, or from nature. For in composing the Odyssey, he has not related every thing which happened to Ulysses; such as the being wounded in Parnassus 1, and pretending to be insane at .-the muster of the Greeks; one of which taking place, it was not necessary or probable that the other should happen;
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but he composed the Odyssey, as also his Iliad, upon one
action.
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It is requisite, therefore, that as in other imitative arts one imitation
is the imitation of one thing, thus,
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also, [in tragedy,] the fable, since it is an imitation of action, should be the imitation of one action, and of the whole of this,
8.4
and that the parts of the transactions should be so arranged, that any one of them being transposed, or taken away, the whole would become different and changed. For that which when present or not present produces no sensible [difference], is not a part of the fable 5.