All revenue to be received for water, to be procured by the works for supplying the city of New York with pure and wholesome water, and furnished to the inhabitants of said city, is especially pledged and appropriated as a Sinking Fund towards .the " redemption of The Water Stock of the City of New York."

Approved by the Mayor, June 19, 1839.

During the next six months, until 31st December, the contractors seem to have pressed forward their work with undiminished zeal, having in their employment, on an average, from 3000 to 4000 men. The expenditures during the year, reached the great amount of $2,300,438, and at the close of it the following results appeared :

1st. The Aqueduct. The whole length of aqueduct, arched complete, is 137,630 running measure, or about 26 miles. That complete on the 1st of July last, as per feet, our semi-annual report of that date, was 77,587 feet, or about 14 and two-thirds miles. The increase in this part of the work, since our last report, is 60,043 feet, or about eleven and one-third miles. 2d. Culverts.. There are now 114 culverts complete and in use, for discharging the water of the several streams on which they are erected. Their length, in the aggregate, is 7542 feet. The number completed at our last report was 92, and their length 6240 feet. There is therefore an increase of twenty-two culverts, since the first of July last. 3d. Tunnels. The number of tunnels excavated through their whole length, is seven, and they are, in the aggregate, 2068 feet in length. There were five completed at our last report, of 1195 feet in length, which shows an increase of two tunnels completed, of 873 feet in length. There are besides the above, nine tunnels in the progress of completion, that have been excavated in the aggregate, 2133 feet, making the total of tunnelling up to the 25th of December, 4201 feet, alnd of masonry on the aqueduct, within the tunnels, 2476 feet, being an increase, during the last six months, of 1964 feet in length. 4th.