It is difficult nowadays to conceive the condition of the streets of a mediæval city, and Paris was no exception. Not only were they very crooked--each householder building where he chose, with very little consideration for the general alignment, badly paved or not at all, unsewered and dark, but they were the receptacles for absolutely all the refuse of the dwellings. The butcher, the baker, and the candlestick-maker threw everything out of the windows, and nobody carried it away. The first vaulted sewer was constructed in the reign of Charles VI, in the Rue Montmartre, by Hugues Aubriot, _prévôt_ of the merchants; but the state of the public thoroughfares remained much as it had been in the preceding century. The houses were built on the level of the streets, and inundated at every violent shower, the choked-up gutters refusing to carry off the sudden flood. Even the kings of France struggled in vain against the universal infection,--"incommoded in their Hôtels Saint-Pol and des Tourelles, they were constantly protesting to the municipality of Paris; Louis XII, François I, and Henri II vainly attempted to secure the removal of the égout Sainte-Catherine; this unwholesome neighborhood even caused François I to change his property of Chanteloup for the locality of the Tuileries." In 1473, the Parlement ordered the Lieutenant Criminel to clear away the filth which obstructed the entrance to Saint-Nicolas-du-Chardonnet and along the course formerly traversed by the Bièvre, and three years later a more general effort at reformation was made. The main streets, the surroundings of the Palais, were submitted to a sort of system of cleaning, the cost of which was defrayed by a tax laid upon the inhabitants thus favored. The aqueduct of Belleville had been constructed in 1244, to supply the fountain of the monastery of Saint-Martin-des-Champs, and afterward furnished water to most of the fountains of Paris; in 1457, it had been repaired by the _prévôt_ of the merchants, and thus supplied a means of cleansing the streets. In 1265, there was existing a fountain in the upper part of the Faubourg Saint-Denis, known as the Fontaine Saint-Lazare, and fed by the aqueduct of Saint-Gervais--from Romainville, near Vincennes--constructed in the last years of the reign of Philippe-Auguste. The fountain of the Innocents, that of Maubuée, and that of the Halles were also watered by this aqueduct of the Pré-Saint-Gervais. The Cité and the quartier Saint-Jacques were for centuries the most pestilential quarters of the capital, and, despite the various measures taken to ameliorate them, it was not till the reign of Henri IV that the evil was effectively attacked by the widening of the streets so as to permit the noblesse and the bourgeoisie to traverse them in carriages.