text:  Newfangled streets and quarters of every age have been added to it but there still remains a mediaeval nucleus--there is still an "old Paris"--a gloomy filthy old town irregular and inconvenient as any town ever was yet; and a walk of twenty minutes will take you from the elegant uniformity of the Rue de Rivoli into the original chaos of buildings--into the Quartier des Halles and into the Rue St Denis