wall, laid on the face of the embankment, which slopes 1| horizontal to one vertical. The embankments are raised four feet above the top of water line, and are 18 feet wide on the top, excepting the high banks on the sourthern division and the western bank on the northern division, which are 21 feet wide. The greater part of the embankments for the northern division are of moderate height but a portion of the eastern and western banks ;

of the southern division are 38 feet high above their base. Vaults or brick arch ways. are constructed, in which iron pipes are laid, so arranged that the pipes from the northern division connect with those from the southern division, and thence pass off to the distributing reservoir, and to supply the adjacent districts. The main vault is on the eastern side it is ;

540 feet long and is 16 feet span that on the western side is 400 feet in length, and 8 feet ;

span designed for supplying at a future day the district on the north river side above 42d ;

street. The pipes are all provided with stop cocks, and so arranged that they can receive the water from either division ;except one pipe from each division, that leads to the disreservoir. It is intended to carry three lines of pipes, each three feet diameter to tributing the distributing reservoir, (at present only two lines are put down,) and the arrangement will allow two pipes to be drawn from either division, so that in the event of emptying one division for repairs, the other would supply two pipes for the distributing reservoir, and all other pipes having a connection with each division would be in full supply, notwithstanding the suspension of one division. A pipe is put through the division bank, with a stop cock, to allow the water or not, as may be desired, to pass from one division to the other.