sailors appear and, with Enrico at their head, they sing a serenade to Delacqua for his birthday the following day. While Delacqua is on the balcony thanking the singers, Barbara slips out to join Enrico. The birthday serenade merges with the sound of Caramello's gondola song as night falls on Venice and the disguised Caramello glides away with his masked sweetheart Annina, neither knowing the true identity of the other. Act 2 Watching from a room in his palace, the Duke is eagerly awaiting the arrival of the gondola in which Caramello is due to bring Barbara, as Agricola, Constantia and the other senators' wives arrive in their carnival costumes, ignoring their husbands' fears for their moral safety. Finally the gondola is seen approaching, and the Duke ushers his guests into the ballroom while he prepares to greet his special lady guest. When Caramello and Annina arrive and masks are removed, Caramello is dismayed to discover who it is he has brought for the Duke's pleasure, but Annina fancies making the most of the opportunity with the Duke that fate has given her. Caramello does his best to warn the Duke off Annina. "Don't trust her. She scratches and bites!" he warns. Finally Annina and the Duke are left alone, and the disguised Annina is shocked and thrown on the defensive when the Duke rhapsodises over the receptive response that his advances to Barbara had previously aroused. As the orchestra in the ballroom strikes up a waltz, the Duke takes the reluctant Annina into his arms. Caramello finds an excuse to interrupt the amorous scene, and Annina persuades the Duke to take her into the ballroom. While they are away, Caramello opens the doors to the Duke's apartments, and a crowd enters, including Pappacoda, prominent in a faded, shabby senator's costume with false, misshapen nose and spectacles and with his pockets stuffed with sausages, meat and pastries. Pappacoda has brought with him all his tradesmen friends, to whom he has distributed invitations given to him by Caramello. They are wide-eyed at the scale of the Duke's hospitality and, having introduced his friends to Caramello, Pappacoda invites them to help themselves. As the Duke seeks somewhere to be alone with Annina, a group of senators and their wives detain him. Among them are Senator Delacqua and his supposed wife, and the Duke is taken aback at being introduced to a second