This bridge, it will be recollected, is, by the plan, to be supported by seven land arches, each of 50 feet span, on the valley between the river and the adjacent hills, and over the river by eight arches of 80 feet span each, the crown of the intrados of the arches is 100 feet above the surface of the water, and the height of the superstructure near 120 feet. We have sunk four coffer dams in the river for the river piers, and built the foundations of two piers to above high water mark, and another is about four feet above the foundation. The amount of money spent on the Harlem Bridge, for the work and materials not yet used, amounts to $91,100. Leaving the Harlem River, as you approach the city, we have section 87 of the aque duct, which includes a small tunnel through rock, completed or nearly so 88, 89 and 90 ;

are in a great state of forwardness when you arrive at section 91, which includes the ;

crossing of Manhattan Valley. This section is a mile in length, and one of the heaviest on the line it consists of 800 feet of tunnel cut through rock, and about three-fourths of ;

a mile of grading for two lines of iron pipes of 36 inches diameter. This last section is about one half completed, and will easily be completed the next fall. We then arrive at section 92, which is nearly completed, with the exception of the tunnel, which is 420 feet long, through rock, 120 feet of which is excavated. The next section, No. 93, is completed, and the account settled. Section No. 94 crosses the Clendening Valley, and embraces a very heavy stone foundation wall and three arches, or aqueduct bridges, for contemplated streets.