Girard, the engineer, by a flight of steps from the cellar of a house where one of the guardians resided. " Convenient arched passages are constructed under three principal streets, where one may walk, and where are laid the different mains taking water from the aqueduct, to conduct it to the various fountains and other points for distribution. They are laid upon stone blocks or cast iron frames, so that they may be easily examined all round, from one end to the other. The beautiful fountain in the Garden of the Palais Royal, that in the Boulevard of Bondy, &c. are supplied from this water. " The canal is estimated by Mr. P. S. Girard the engineer who constructed it, and had the whole superintendence of distributing the water in Paris, at 4000 inches of water, (polices tfeau de fontainier.) An inch of water is so much as will flow through a hole one inch diameter, French measure, in a minute, under a head of 7-12 of an inch above the centre of the aperture, and is equal to 813 1-2 cubic inches in a minute, or 678 cubic feet in 24 hours, amounting to 2,711,680 feet for the 4000 inches daily, or over 20 million gallons. " The quantity of water necessary for a given number of inhabitants has not been accurately fixed. In France it has been generally estimated at 19,195 litres (one inch) for 1,000 inhabitants. The Scotch engineers do not consider the supply complete at less lhan nine gallons a day for each individual in a city. If we compare the distribution of water in London with the population, the supply is at the jate of 20 gallons for each person. But there are no public fountains in that city, and the people receive no water but what is furnished by independent companies.