The structure which is generally taken to underlie the composition of the plays of Aristophanes is made up of a number of quantitative parts which have been abstracted by dividing the comedies into broad sections. It roughly corresponds to the quantitative division of tragedy offered by the twelfth chapter of Aristotle'sPoetics, and includes prologue,parodos, ‘proagon’or ‘battle scene,’ ‘epirrhematicagon,’ parabasis, iambic scenes, choral songs orstasimo, exodos.