to be constructed (and is now in progress) at an elevation of 114 feet above the level of high tide in the Harlem river, on which iron pipes are to be laid to convey the water across the valley. The shore on the southerly side of the river is a bold, precipitous rock, rising at an angle of about 30 degrees, to a height of 220 feet, or about 100 feet above the level of the bottom of the aqueduct. After crossing this valley, the aqueduct of masonry is resumed, and continued 2.015 miles, to the termination of the high ground on the north side of Manhattan valley. This valley is 0.792 mile wide at the level of the aqueduct below which it descends ;

102 feet. The conduit of masonry here gives place to iron pipes, which descend into the bottom of the valley, and rise again to the proper level on the opposite side from which ;

point the masonry conduit is again resumed, and crossing the Asylum ridge, and Clendening valley, is continued 2,173 miles,, to the receiving reservoir at Yorkville. This reservoir is bounded by 86th street on the north, 79th street on the south, 7th Avenue on the west, and 6th Avenue on the east. It is 1826 "feet long and 836 feet wide on the outside angle of the embankment; containing an area of 35 acres, divided into two divisions, and is (a little over) 5 miles from the City Hall. From the receiving reservoir, a double line of iron pipes three feet in diameter, are laid down in 80th street and 5th Avenue, to convey the water 2..176 miles to the distributing reservoir at Murray Hill. The location of this reservoir is on the 5th Avenue, between 40th and 42d streets, and is three miles from the City Hall ; it is 420 feet square on the cornice of the exterior wall,