Of great houses there were as yet but few--Blackwell Hall, if it then stood, would be called Bassing Hall--Aldermanbury, the predecessor of Guildhall, was built by this time; and we hear of certain great men having houses in the City--Earl Ferrars in Lombard Street next to Allhallows and Pont de l'Arche in Elbow Lane, Dowgate Ward, what time Henry the First was King. The water supply of the City until the later years of the thirteenth century was furnished by the Walbrook, the Wells or Fleet rivers, and the springs or fountains outside the walls, of which Stow enumerates a great many. I suppose that the two streams very early became choked and fouled and unfit for drinking. But the conduits and "Bosses" of water were not commenced till nearly the end of the thirteenth century. Water-carts carried round fresh water, bringing it into the town from the springs and wells on the north. One does not find, however, any period in the history of London when the citizens desired plain cold water as a beverage. Beer was always the national drink; they drank small ale for breakfast, dinner, and supper; when they could get it they drank strong ale. Of water for washing there was not at this period so great a demand as at present. At the same time it is not true to say, as was said a few years ago in the House of Commons, that for eight hundred years our people did not wash themselves. All through the Middle Ages the use of the hot bath was not only common, but frequent, and in the case of the better classes was almost a necessity of life. [Illustration: CRYPT OR LOWER CHAPEL OF ST. THOMAS'S CHURCH, LONDON BRIDGE] The population of this busy city is tolerably easy to calculate. The astounding statement of the good Fitz Stephen that London could turn out an army of 20,000 horse and 60,000 foot, must of course, be dismissed without argument. Some minds are wholly incapable of understanding numbers. Perhaps Fitz Stephen had such a mind. Perhaps in writing the numerals the numbers got multiplied by ten--Roman numerals are hard to manage. If we assume an average of 400 for each parish church, which, considering that the church was used daily by the people, seems not too little, we get a population of about 50,000. In the time of Richard's poll tax, 300 years later, the population was about 40,000. But then the City had been ravaged by a succession of plagues. [Illustration: WEST FRONT OF CHAPEL ON LONDON BRIDGE]