MEMOIR OF THE face of the water, without finding rock, it was determined to place this pier on piles, and this work is now in progress. Although disappointed in not finding a stone foundation, we find the earth in the bed of the river of a compact character, and well suited to give security to the pier, by piling. The foundations for piers Nos. 7, 8 and 9 are, all of them, with their mason work, carried up above high water. Piers Nos. 3 and 4 have, also, been piled for masonry and ;

on piers Nos. 5 and 6, the masonry has been raised to eleven feet in height. We have supposed that the details of expenditure for Harlem Bridge, would be intethe amount paid, from the resting to your honorable bodies, and have therefore to state, that beginning, and due to the first of January inst, is $210,000. The continuation of the work, sinking the remaining piers and driving the piles, mainly necessary for the proposed temporary bringing of the water across the river, and the expense of laying the pipes for that purpose, will amount to $116,558. The estimated cost of carrying the bridge up to its contemplated height, from the point or position in which it will be, on the 1st of July next, will amount to $596,779. After the water is introduced, by these temporary means, there will be no pressing necessity for the high bridge being erected faster than is convenient for the resources of the Corporation, and the economy of its construction, provided no objection should be urged against a reasonable interruption of the river navigation, by the persons interested therein, the value of which navigation is, at present, too small to be estimated.