NO society in Europe was more agreeable and brilliant than that of the Duchess of Berry. The fêtes given by the Princess in the salons of the Pavilion de Marsan at the Tuileries were marked by exceptional elegance and good taste; the petit château, as her vivacious social staff was called at that time, had an extraordinary brightness and animation. At the carnival of 1829 Madame organized a costume ball, which, for its brilliancy, was the talk of the court and the city. All the costumes were those of one period, -- that at which the dowager queen of Scotland, Marie of Lorraine, widow of James V., came to France to visit her daughter, Mary Stuart, wife of the King, Francis II. It was decided that Mary Stuart should be represented by the Duchess of Berry, and the King, Francis II., by the oldest of the sons of the Duke of Orleans, the Duke of Chartres, who was then eighteen and one-half years old, and who was, the next year, to take the title of Duke of Orleans, on the accession of his father to the throne. The apartments of the Children of France in the Pavillon do Marsan were chosen for the ball, and the date was fixed at Monday, March 2, 1829.