One of the strongest satires on the reigning dramatic style, Diderot found in the need that the actor had of the mirror. The fewer gestures, he said, the better; frequent gesticulation impairs energy and destroys nobleness. It is the countenance, the eyes, it is the whole body that ought to move, and not the arms.[280] There is no maxim more forgotten by poets than that which says that great passions are mute. It depends on the player to produce a greater effect by silence than the poet can produce by all his fine speeches.[281] Above all, the player is to study tranquil scenes, for it is these that are the most truly difficult. He commends a young actress to play every morning, by way of orisons, the scene of Athalie with Joas; to say for evensong some scenes of Agrippina with Nero; and for Benedicite the first scene of Phædra with her confidante. Especially there is to be little emphasis—a warning grievously needed by ninety-nine English speakers out of a hundred—for emphasis is hardly ever natural; it is only a forced imitation of nature.[282]

Diderot had perceived very early that the complacency with which his countrymen regarded the national theatre was extravagant. He would not allow a comparison between the conventional classic of the French stage and the works of the Greek stage. He insisted in the case of the Greeks that their subjects are noble, well chosen, and interesting; that the action seems to develop itself spontaneously; that their dialogue is simple and very close to what is natural; that the dénouements are not forced; that the interest is not divided nor the action overloaded with episodes. In the French classic he found none of these merits. He found none of that truth which is the only secret of pleasing and touching us; none of that simple and natural movement which is the only path to perfect and unbroken illusion. The dialogue is all emphasis, wit, glitter; all a thousand leagues away from nature. Instead of artificially giving to their characters esprit at every point, poets ought to place them in such situations as will give it to them. Where in the world did men and women ever speak as we declaim? Why should princes and kings walk differently from any man who walks well? Did they then gesticulate like raving madmen? Do princesses when they speak utter sharp hissings?

People believe us to have brought tragedy to a high degree of perfection. It is not so. Of all kinds of literature it is the most imperfect.[283]

The ideas which appeared thus incongruously in the tales of 1748 reappeared in the direct essays on the drama in 1757 and 1758. We have left nothing undone, he said, to corrupt dramatic style. We have preserved from the ancients that emphasis of versification which was so well fitted to languages of strong quantity and marked accent, to vast theatres, to a declamation that had an instrumental accompaniment; and then we have given up simplicity of plot and dialogue, and all truth of situation.[284] La Motte nearly fifty years before had attacked the pseudo-classic drama. He had inveighed against the unities, against long monologues, against the device of confidants, and against verse. His assault, in which he had the powerful aid of Fontenelle, was part of that battle between Moderns and Ancients with which the literary activity of the century had opened. The brilliant success of the tragedies of Voltaire had restored the lustre of the conventional drama, though Voltaire infused an element of the romantic under the severity of the old forms. But the drama had become even less like Sophocles and Euripides in Zaïre than in Phédre or Iphigénie. Voltaire intended to constitute the French drama into an independent form. He expected to be told that he was not like Sophocles, and he did not abstain from some singularly free railing against Euripides. The Greek pieces often smacked too much of the tone of the fair to satisfy him; they were too familiar and colloquial for a taste that had been made fastidious by the court-pieces of Lewis XIV. Diderot was kept free from such deplorable criticism as this by feeling that the Greek drama was true to the sentiment of the age that gave it birth, and that the French drama, if not in the hands of Racine, still even in the hands of Voltaire, and much more in the hands of such men as Lagrange-Chancel and the elder Crébillon, was true to no sentiment save one purely literary, artificial, and barren. He insists on the hopelessness of the stage, unless men prepared themselves at every part for a grand return to nature. We have seen what is his counsel to the actor. He preaches in the same key to the scene-painter and the maker of costumes. Scene-painting ought to be more rigorously true than any other kind of picture. Let there be no distraction, no extraneous suggestion, to interfere with the impression intended by the poet. Have you a salon to represent? Let it be that of a man of taste and no more: no ostentation and no gilding, unless the situation expressly demands the contrary.

In the dresses the same rule holds good. Under robes that are overladen with gold lace, I only see a rich man; what I want to see is a man. Pretty and simple draperies of severe tints are what we need, not a mass of tinsel and embroidery. "A courageous actress has just got rid of her panier, and nobody has found her any the worse for it. Ah, if she only dared one day to show herself on the stage with all the nobility and simplicity of adjustment that her characters demand; nay, in the disorder into which she would be thrown by an event so terrible as the death of a husband, the loss of a son, and the other catastrophes of the tragic stage, what would become, round her dishevelled figure, of all those powdered, curled, frizzled, tricked-out creatures? Sooner or later they must put themselves in unison. O nature, nature! We can never resist her."[285]

From all this we turn, for a few moments only, and not too cheerfully, to the Serbonian bog of dramatic rules and the metaphysics of the theatre. There is no subject in literature, not even the interpretation of the Apocalypse, which has given birth to such pedantic, dismal, and futile discussion. The immense controversy, carried on in books, pamphlets, sheets and flying articles, mostly German, as to what it was that Aristotle really meant by the famous words in the sixth chapter of the Poetics, about tragedy accomplishing the purification of our moods of pity and sympathetic fear, is one of the disgraces of human intelligence, a grotesque monument of sterility. The great tap-root of fallacy has been and remains the incessant imputation of ethical or social purpose to the dramatist, and the demand of direct and combined ethical or social effect from the drama. There is no critic, from the great Aristotle downwards, who has steered quite clear of these evil shallows; Diderot, as we have seen, least of all. But Diderot disarms the impatience which narrower critics kindle, by this magnificent concession, coming at the close of all: "Especially remember that there is no general principle; I do not know a single one of those that I have indicated which a man of genius cannot infringe with success."[286] Here we listen to the voice of the genuine Diderot; and if this be granted, we need not give more than a passing attention to the rules that have gone before—about the danger of borrowing in the same composition the shades both of the comic and of the tragic styles; about movement being injurious to dignity, and of the importance therefore of not making the principal personage the machinist of the piece; about the inexpediency of episodic personages —and so forth. The only remark worth making on these propositions is that, whatever their value may be, Diderot at any rate, like a true philosopher, generalised from the facts of nature and art. He did not follow the too common critical method of reading one's own ideas into a work of art, and then taking them back again in the more imposing form of inevitable deductions from the work itself.

What Diderot conceived himself really to have done, was to have sketched and constituted a new species in the great dramatic kingdom. Every one knows, he said, that there is tragedy and that there is comedy, but we have to learn that there is room in nature and the art of the stage for a third division, namely, the genre sérieux, a kind of comedy that has for its object virtue and the duties of man. Why should the writer of comedy confine his work to what is vicious or ridiculous in men? Why should not the duties of men furnish the dramatist with as ample material as their vices? Surely in the genre honnête et sérieux the subject is as important as in gay comedy. The characters are as varied and as original. The passions are all the more energetic as the interest will be greater. The style will be graver, loftier, more forcible, more susceptible of what we call sentiment, a quality without which no style ever yet spoke to the heart. The ridiculous will not be absent, for the madness of actions and speeches, when they are suggested by the misunderstanding of interests or by the transport of passion, is the truly ridiculous thing in men and in life.[287]

Besides his own two pieces, Diderot would probably have pointed to Terence as the author coming nearest to the genre sérieux. If Goethe's bad play of Stella had retained the close as he originally wrote it, with the bigamous Fernando in the last scene rejoicing over the devoted agreement of the two ladies and his daughter to live with him in happy unity, that would perhaps have been a comedy of the genre sérieux, with the duties of man gracefully adapted to circumstances.

The theory of the genre sérieux has not led to the formation of any school of writers adopting it and working it out, or to the production of any masterpiece that has held its ground, as has happened in tragedy, comedy, and farce. Beaumarchais, who at last achieved such a dazzling and portentous success by one dramatic masterpiece, began his career as a playwright by following the vein of The Father of the Family; but The Marriage of Figaro, though not without strong traces of Diderotian sentiment in pungent application, yet is in its structure and composition less French than Spanish. It is quite true, as Rosenkranz says, that the prevailing taste on the French stage in our own times favours above all else bourgeois romantic comedy, written in prose.[288] But the strength of the romantic element in them would have been as little satisfactory to Diderot's love of realistic moralising as the conventional tragedy of the court of Lewis XIV. The Fable of most of them turns on adultery, and this is not within the method of the genre sérieux as expounded by Diderot. Perhaps half a dozen comedies, such, for instance, as The Ideas of Madame Aubray, by M. Dumas, are of the genre sérieux, but certainly there are not enough of such comedies to constitute a genuine Diderotian school in France. There is no need therefore to say more about the theory than this, namely, that though the drama is an imitative art, yet besides imitation its effects demand illusion. What, cries Diderot, you do not conceive the effect that would be produced on you by a real scene, with real dresses, with speech in true proportion to the action, with the actions themselves simple, with the very dangers that have made you tremble for your parents, for your friends, for yourselves? No, we answer: reproduction of reality does not move us as a powerful work of imagination moves us. "We may as well urge," said Burke, "that stones, sand, clay, and metals lie in a certain manner in the earth, as a reason for building with these materials and in that manner, as for writing according to the accidental disposition of characters in Nature."[289] Common dangers do not excite us; it is the presentation of danger in some uncommon form, in some new combination, in some fresh play of motive and passion, that quickens that sympathetic fear and pity which it is the end of a play to produce. And if this be so, there is another thing to be said. If we are to be deliberately steeped in the atmosphere of Duty, illusion is out of place. The constant presence of that severe and overpowering figure, "Stern Daughter of the Voice of God," checks the native wildness of imagination, restricts the exuberance of fancy, and sets a rigorous limit to invention. Diderot used to admit that the genre sérieux could never take its right place until it had been handled by a man of high dramatic genius. The cause why this condition has never come to pass is simply that its whole structure and its regulations repel the faculties of dramatic genius.

Besides the perfection of the genre sérieux, Diderot insisted that the following tasks were also to be achieved before the stage could be said to have attained the full glory of the other arts. First, a domestic or bourgeois tragedy must be created. Second, the conditions of men, their callings and situations, the types of classes, in short, must be substituted for mere individual characters. Third, a real tragedy must be introduced upon the lyric theatre. Finally, the dance must be brought within the forms of a true poem.