Among the multitude of Russians who throng around Demetrius in Tula appears a man whom he at once recognizes; he is greatly delighted to see him. He bids all the rest withdraw, and so soon as he is alone with this man he thanks him, with full heart, as his preserver and benefactor. This person hints that Demetrius is under especial obligations to him, and to a greater extent than he is himself aware. Demetrius urges him to explain, and the assassin of the genuine Demetrius thereupon discloses the real facts of the case. For this murder he had received no recompense, but on the contrary had nothing but death to anticipate from Boris. Thirsting for revenge, he stumbled upon a boy, whose resemblance to the Czar Ivan struck him. This circumstance must be turned to account. He seized the boy, fled with him from Uglitsch, brought him to a monk, whom he succeeded in gaining over for his ends, and delivered to him the trinkets which he had himself taken from the murdered Demetrius. By means of this boy, whom he had never lost sight of, and whose steps he had attended upon all occasions without being observed, he is now revenged. His tool, the false Demetrius, rules over Russia in Boris' room. During this narration a mighty change comes over Demetrius. His silence is awful. In the moment of the highest rage and despair, the assassin drives him to the extreme of endurance, when with a defying and insolent air he demands his reward. Demetrius strikes him to the earth. Soliloquy of Demetrius. Internal conflict; but the feeling of the necessity for maintaining his position as Czar is triumphant. The delegates from Moscow arrive, and submit themselves to Demetrius. They are received gloomily, and with a menacing demeanor. Among them is the Patriarch. Demetrius deposes him from his dignity, and soon afterwards sentences to death a Russian of rank, who had questioned the authenticity of his birth. MARFA and OLGA await Demetrius under a magnificent tent. Marfa speaks of the approaching interview with more doubt and fear than hope, and trembles as the moment draws near which should assure her highest happiness. Olga speaks to her, herself without faith. During the long journey they have both had time to recall the whole circumstances; the first exultation had given place to reflection. The gloomy silence and the repulsive glances of the guards who surround the tent serve still further to augment their despondency. The trumpets sound. Marfa is irresolute whether she shall advance to meet Demetrius. Now he stands before her alone. The little that was left of hope in her heart altogether vanishes on seeing him. An unknown something steps between them--Nature does not speak--they are separated forever. The first impulse is an endeavor to approach; Marfa is the first to make a movement to recede. Demetrius observes it, and remains for a moment paralyzed. Significant silence. DEMETRIUS. Does thy heart say nothing? Dost thou not recognize thy blood in me?