Let us now hear what Aristotle says on the Unity of Action.

"We affirm that Tragedy is the imitation of a perfect and entire action which has a certain magnitude: for there may be a whole without any magnitude whatever. Now a whole is what has a beginning, middle, and end. A beginning is that which is not necessarily after some other thing, but that which from its nature has something after it, or arising out of it. An end, on the other hand, is that which from its nature is after something else, either necessarily, or usually, but after which there is nothing, A middle, what is itself after some other thing, and after which also there is something. Hence poems which are properly composed must neither begin nor end accidentally, but according to the principles above laid down."

Strictly speaking, it is a contradiction in terms to say that a whole, which has parts, can be without magnitude. But Aristotle goes on to state, in explanation, that by "magnitude" as a requisition of beauty, he means, a certain measure which is neither so small as to preclude us from distinguishing its parts, nor so extensive as to prevent us from taking the whole in at one view. This is, therefore, merely an external definition of the beautiful, derived from experience, and founded on the quality of our organs of sense and our powers of comprehension. However, his application of it to the drama is remarkable. "It must have an extension, but such as may easily be taken in by the memory. The determination of the length according to the wants of the representation, does not come within the province of Art. With respect to the essence of the thing, the composition will be the more beautiful the more extensive it is without prejudice to its comprehensibility." This assertion would be highly favourable for the compositions of Shakspeare and of other romantic poets, who have included in one picture a more extensive circle of life, characters, and events, than is to be found in the simple Greek tragedy, if only we could show that they have given it the necessary unity, and such a magnitude as can be clearly taken in at a view, and this we have no hesitation in affirming to be actually the case.

In another place Aristotle requires the same unity of action from the epic as from the dramatic poet; he repeats the preceding definitions, and says that the poet must not resemble the historian, who relates contemporary events, although they have no bearing on one another. Here we have still a more express demand of that connexion of cause and effect between the represented events, which before, in his explanation of the parts of a whole, was at most implied. He admits, however, that the epic poet may take in a much greater number of events connected with one main action, since the narrative form enables him to describe many things as going on at the same time; on the other hand, the dramatic poet cannot represent several simultaneous actions, but only so much as is going on upon the stage, and the part which the persons who appear there take in one action. But what if a different construction of the scene, and a more skilful theatric perspective, should enable the dramatic poet, duly and without confusion, although in a more compressed space, to develope a fable not inferior in extent to the epic poem? Where would be the objection, if the only obstacle were the supposed impossibility?

This is nearly all that is to be found in the Poetics of Aristotle on Unity of Action. A short investigation will serve to show how very much these anatomical ideas, which have been stamped as rules, are below the essential requisites of poetry.

Unity of Action is required. What is action? Most critics pass over this point, as if it were self-evident In the higher, proper signification, action is an activity dependent on the will of man. Its unity will consist in the direction towards a single end; and to its completeness belongs all that lies between the first determination and the execution of the deed.

This idea of action is applicable to many tragedies of the ancients (for instance, Orestes' murder of his mother, Oedipus' determination to discover and punish the murderer of Laius), but by no means to all; still less does it apply to the greater part of modern tragedies, at least if the action is to be sought in the principal characters. What comes to pass through them, and proceeds with them, has frequently no more connexion with a voluntary determination, than a ship's striking on a rock in a storm. But further, in the term action, as understood by the ancients, we must include the resolution to bear the consequences of the deed with heroic magnanimity, and the execution of this determination will belong to its completion. The pious resolve of Antigone to perform the last duties to her unburied brother is soon executed and without difficulty; but genuineness, on which alone rests its claim to be a fit subject for a tragedy, is only subsequently proved when, without repentance, and without any symptoms of weakness, she suffers death as its penalty. And to take an example from quite a different sphere, is not Shakspeare's Julius Caesar, as respects the action, constructed on the same principle? Brutus is the hero of the piece; the completion of his great resolve does not consist in the mere assassination of Caesar (an action ambiguous in itself, and of which the motives might have been ambition and jealousy), but in this, that he proves himself the pure champion of Roman liberty, by the calm sacrifice of his amiable life.

Farther, there could be no complication of the plot without opposition, and this arises mostly out of the contradictory motives and views of the acting personages. If, therefore, we limit the notion of an action to the determination and the deed, then we shall, in most cases, have two or three actions in a single tragedy. Which now is the principal action? Every person thinks his own the most important, for every man is his own central point. Creon's determination to maintain his kingly authority, by punishing the burial of Polynices with death, is equally fixed with Antigone's determination, equally important, and, as we see at the end, not less dangerous, as it draws after it the ruin of his whole house. It may be perhaps urged that the merely negative determination is to be considered simply as the complement of the affirmative. But what if each determines on something not exactly opposite, but altogether different? In the Andromache of Bacine, Orestes wishes to move Hermione to return his love; Hermione is resolved to compel Pyrrhus to marry her, or she will be revenged on him; Pyrrhus wishes to be rid of Hermione, and to be united to Andromache; Andromache is desirous of saving her son, and at the same time remaining true to the memory of her husband. Yet nobody ever questioned the unity of this piece, as the whole has a common connexion, and ends with one common catastrophe. But which of the actions of the four persons is the main action? In strength of passion, their endeavours are pretty nearly equal—in all the whole happiness of life is at stake; the action of Andromache has, however, the advantage in moral dignity, and Racine was therefore perfectly right in naming the piece after her.

We see here a new condition in the notion of action, namely, the reference to the idea of moral liberty, by which alone man is considered as the original author of his own resolutions. For, considered within the province of experience, the resolution, as the beginning of action, is not a cause merely, but is also an effect of antecedent motives. It was in this reference to a higher idea, that we previously found the unity and wholeness of Tragedy in the sense of the ancients; namely, its absolute beginning is the assertion of Free-will, and the acknowledgment of Necessity its absolute end. But we consider ourselves justified in affirming that Aristotle was altogether a stranger to this view; he nowhere speaks of the idea of Destiny as essential to Tragedy. In fact, we must not expect from him a strict idea of action as a resolution and deed. He says somewhere—"The extent of a tragedy is always sufficiently great, if, by a series of probable or necessary consequences, a reverse from adversity to prosperity, or from happiness to misery, is brought about." It is evident, therefore, that he, like all the moderns, understood by action something merely that takes place. This action, according to him, must have beginning, middle, and end, and consequently consist of a plurality of connected events. But where are the limits of this plurality? Is not the concatenation of causes and effects, backwards and forwards, without end? and may we then, with equal propriety, begin and break off wherever we please? In this province, can there be either beginning or end, corresponding to Aristotle's very accurate definition of these notions? Completeness would therefore be altogether impossible. If, however, for the unity of a plurality of events nothing more is requisite than casual connexion, then this rule is indefinite in the extreme, and the unity admits of being narrowed or enlarged at pleasure. For every series of incidents or actions, which are occasioned by each other, however much it be prolonged, may always be comprehended under a single point of view, and denoted by a single name. When Calderon in a single drama describes the conversion of Peru to Christianity, from its very beginning (that is, from the discovery of the country) down to its completion, and when nothing actually occurs in the piece which had not some influence on that event, does he not give us as much Unity in the above sense as the simplest Greek tragedy, which, however, the champions of Aristotle's rules will by no means allow?

Corneille was well aware of the difficulty of a proper definition of unity, as applicable to an inevitable plurality of subordinate actions; and in this way did he endeavour to get rid of it. "I assume," says he, "that in Comedy, Unity of Action consists in Unity of the Intrigue; that is, of the obstacles raised to the designs of the principal persons; and in Tragedy, in the unity of the danger, whether the hero sinks under, or extricates himself from it. By this, however, I do not mean to assert that several dangers in Tragedy, and several intrigues or obstacles in Comedy, may not be allowable, provided only that the personage falls necessarily from one into the other; for then the escape from the first danger does not make the action complete, for it draws a second after it, as also the clearing up of one intrigue does not place the acting persons at their ease, because it involves them in another."