I hope it is not rash to surmise that the much-debated word __katharsis__, 'purification' or 'purgation', may have come into Aristotle's mouth from the same source. It has all the appearance of being an old word which is accepted and re-interpreted by Aristotle rather than a word freely chosen by him to denote the exact phenomenon he wishes to describe. At any rate the Dionysus ritual itself was a _katharmos_ or _katharsis_--a purification of the community from the taints and poisons of the past year, the old contagion of sin and death. And the words of Aristotle's definition of tragedy in Chapter VI might have been used in the days of Thespis in a much cruder and less metaphorical sense. According to primitive ideas, the mimic representation on the stage of 'incidents arousing pity and fear' did act as a _katharsis_ of such 'passions' or 'sufferings' in real life. (For the word _pathemata_ means 'sufferings' as well as 'passions'.) It is worth remembering that in the year 361 B.C., during Aristotle's lifetime, Greek tragedies were introduced into Rome, not on artistic but on superstitious grounds, as a _katharmos_ against a pestilence (Livy vii. 2). One cannot but suspect that in his account of the purpose of tragedy Aristotle may be using an old traditional formula, and consciously or unconsciously investing it with a new meaning, much as he has done with the word _mythos_. Apart from these historical causes of misunderstanding, a good teacher who uses this book with a class will hardly fail to point out numerous points on which two equally good Greek scholars may well differ in the mere interpretation of the words. What, for instance, are the 'two natural causes' in Chapter IV which have given birth to Poetry? Are they, as our translator takes them, (1) that man is imitative, and (2) that people delight in imitations? Or are they (1) that man is imitative and people delight in imitations, and (2) the instinct for rhythm, as Professor Butcher prefers? Is it a 'creature' a thousand miles long, or a 'picture' a thousand miles long which raises some trouble in Chapter VII? The word _zoon_ means equally 'picture' and 'animal'. Did the older poets make their characters speak like 'statesmen', _politikoi_, or merely like ordinary citizens, _politai_, while the moderns made theirs like 'professors of rhetoric'? (Chapter VI, p. 38; cf. Margoliouth's note and glossary).