La Scala di seta.

"The Silken Ladder" - Dormont is the teacher and guardian of the beautiful Giulia, and he is determined that she will marry Blansac despite her continual rejection of his advances. The fact is that Giulia is already married to Blansac's friend Dorvil, who every night is able to exercise his conjugal rights because Giulia lowers a ladder made of silk down to him from her bedroom window.