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Rh whet his appetite; not enough to satisfy it. These are general rules that apply to all good drama. They can all be studied in Mr. Archer's book, Play-Making: A Manual of Craftsmanship. In ancient times they were more developed by Euripides than by his predecessors, but that is all we need say.

Prologue; Set Speech; Messenger; there still remain two stumbling-blocks to a modern reader of Greek tragedies, the Deus ex Mâchinâ (or "God from the Machine") and the Chorus.

About the appearance of the god we need say little. We have seen above that an epiphany of some Divine Being or a Resurrection of some dead Hero seems to have been an integral part of the old ritual and thus has its natural place in tragedy. His special duty is to bring the action to a quiet close and to ordain the ritual on which the tragedy is based—thus making the performance itself a fulfilment of the god's command (see above p. 66). The actual history of this epiphany is curious. As far as our defective evidence allows us to draw conclusions we can make out that Aeschylus habitually used a divine epiphany, but that he generally kept it for the last play of a trilogy; that he often had a whole