When this is completed, and the streets and grounds about it are regulated, it will be one of the most interesting objects of utility and curiosity to citizens and strangers, which our country affords. Ever since the completion of the masonry of the aqueduct, it has been frequently and carefully examined, with a view to detect defects, if any existed, or failure, if any should take place and it has been found, with slight exceptions, to continue as perfect ;

as on the day it was finished. In the few cases where imperfections have been found in the interior, they have been repaired, and the work improved in such manner as is supposed will secure its future permanency the exterior covering of earth has, in several places, been enlarged and secured, ;

sometimes by covering with turf, and sometimes by a layer of broken stones.

Having described the progress and proximate completion of the work under our charge, we have the satisfaction further, formally, to communicate to the Common Council, that the dam, the aqueduct, and the reservoirs are now all in operation and successfully performing the work for which they were designed. On the 8th June, the Commissioners, accompanied by the engineers, commenced a journey through the aqueduct, on foot, which was completed in the two succeeding days, to Harlem river, a distance of 33 miles. The whole line having been found in good condition, orders were given to close the openings which had been left in the bottom, for the escape of water which flowed into the work in tunnels and deep cuttings. This having been done, and the dam raised sufficiently to cause the water to flow into the aqueduct, it was admitted to the depth of 18 inches, at 5 o'clock in the morning of the 22d June.