DIRECTLY before the Church of Saint Paul and Saint Louis the Rue de Sevigne leads through to the Rue des Francs-Bourgeois where at the angle of the two streets stands the chief treasure of the Marais, the famous house of Madame de Sevigne, the Hotel Carnavalet. The perfection of the type of private dwellings, of which the Hotel de Sully is a later and more ostentatious development, the Hotel Carnavalet, having been taken early by the city for the installation of its municipal museum, has escaped all the misfortunes of degenerating private occupation and ownership.