The Pope having directed new experiments and observations to be made, it was found that although the level of the lake was about one and a half palms above the surface of the ancient reservoir which fed the aqueduct, that this additional head was insufficient to produce the velocity to furnish the supply which was considered to be desirable. To obtain this velocity, a weir or dam was erected across the mouth of the lake to preserve its waters at the proper height, and the usual means of regulating the head, and disposing of the superfluous water by sluices was resorted to. The aqueduct now received the name of Aqua Paola, from the name of the pontiff, Paul V., in whose reign it was brought to Rome. It is a remarkable

proof of the stability of the old Roman works, that when, 1000 years after the interruption of this water course by the Goths, water was again let into it by direction of Cardinal

Orsini, it flowed on through a length of ten miles without obstruction or leakage. The quantity of water furnished by this aqueduct is estimated at about 94,184 cubic metres in twenty-four hours.

Thus, from the three modern aqueducts not less than 180,500 cubic metres of water are daily introduced into Rome ; yet the want of cleanliness is remarkable in every street and corner of the city. The water is not conveyed by pipes into the upper floors of the houses, but into a common fountain in their courts. In order to raise it to these stories, a