Two surviving plays of the period are _El Trato de Argel_ and _La Numancia_, first printed by Antonio de Sancha in 1784. The former deals with the life of the Christian slaves in Algiers, and recounts the passion of Zara the Moor for the captive Aurelio, who is enamoured of Silvia. We must assume that Cervantes thought well of this invention, since he utilised it some thirty years later in _El Amante Liberal_; but the play is merely futile. The introduction of a lion, of the Devil, and of such abstractions as Necessity and Opportunity, is as poor a piece of machinery as theatre ever saw; the versification is rough and creaking, improvised without care or conscience; the situations are arranged with a glaring disregard for truth and probability. Like Paolo Veronese, Cervantes could rarely resist the temptation of painting himself into his canvas, and in _El Trato de Argel_ he takes care that the prisoner Saavedra should declaim his tirade. The piece has no dramatic interest, and is valuable merely as an over-coloured picture of vicissitudes by one who knew them at first-hand, and who presented them to his countrymen with a more or less didactic intention. Yet, even as a transcript of manners, this luckless play is a failure. A finer example of Cervantes' dramatic power is the _Numancia_, on which Shelley has passed this generous judgment:—"I have read the _Numancia_, and, after wading through the singular stupidity of the First Act, began to be greatly delighted, and at length interested in a very high degree, by the power of the writer in awakening pity and admiration, in which I hardly know by whom he is excelled. There is little, I allow, to be called _poetry_ in this play; but the command of language and the harmony of versification is so great as to deceive one into an idea that it is poetry." Nor is Shelley alone in his admiration. Goethe's avowal to Humboldt is on record:—"Sogar habe ich ... neulich das Trauerspiel _Numancia_ von Cervantes mit vielem Vergnügen gelesen;" but eight years later he confided a revised judgment to Riemer. The gushing school of German Romantics waxed delirious in praise. Thus Friedrich Schlegel surpassed himself by calling the play "godlike"; and August Schlegel, not content to hold it for a dramatic masterpiece, would persuade us to accept it for great poetry. Even Sismondi declares that "le frisson de l'horreur et de l'effroi devient presque un supplice pour le spectateur."