The quantity of foundation wall laid, amounted to 28,000 cubic yards, and of protection wall, 13.160 cubic yards. This is but a very brief sketch of the work which has been performed, and is confined altogether to the operations on the first and second divisions, exclusive of the large amount of excavation in rock and earth on a line of thirty-three miles in length, nearly the whole of which has been completed, together with a large amount of building materials prepared.

The contractors on the sections lately placed under contract, comprising the whole of the THIRD and a portion of the FOURTH divisions, have commenced their work with spirit, and appear unwilling to be outdone by their predecessors on the works. The number of mechanics and laborers employed on the whole line, on the 25th ultimo, was 3043 ;

they will be very considerably increased during the summer, as the Commissioners have good reason to hope which will enable them to show, in their next semi-annual report, ;

an important addition to the work under their charge. The whole length of aqueduct now under contract, extending from the Croton to the Harlem River, is THIRTY-THREE MILES.

Owing to a turn-out for wages early in the season, the work on the line between the dam and Sing Sing, was somewhat retarded. The promptness of the magistrates of that town prevented the evil from spreading, and the contractors having taken back such of the laborers as they were still willing to receive, and refusing on any terms to employ the