Read it through once

“It was on one of these days, when my cottagers periodically rested from labour—the old man played on his guitar, and the children listened to him—that I observed the countenance of Felix was melancholy beyond expression; he sighed frequently, and once his father paused in his music, and I conjectured by his manner that he inquired the cause of his son’s sorrow. Felix replied in a cheerful accent, and the old man was recommencing his music when someone tapped at the door.