This amount the reservoir would supply for 62 days, without any aid from occasional rains which may safely ;

be relied upon, to keep up the required supply from the reservoir, beyond any drought we have ground to apprehend. The supply of the Croton, from its daily flow, aided by this reservoir, may therefore be taken witfrgreat confidence at 35,000,000 gallons, which will be very ample for the wants of the city for a long time to come and when the day ;

arrives that it will require a larger quantity, it may be obtained by constructing other reservoirs further up the stream, where there are abundant facilities for such purposes." The total cost of the aqueduct, from the Croton dam to the distributing reservoir inclusive, will be nearly 9,000,000 of dollars,

New- York, 27th July, 1842.

The unfinished portions of the work, chiefly on the Harlem bridge, have been steadily advancing during the period since the introduction of the Croton into the city and by a ;

letter of recent date from the chief engineer, we are informed that " the foundations for the

two last water piers at Harlem bridge are now in progress ; the piles are driven for one of

them, and they are nearly ready to receive the cap timbers and flooring on which the masonry is to be constructed. For the other the piling is in progress. On the last foundation put down, the masonry is proceeding, and is nearly up to high water line. All the other piers are raised above high water, and the- masonry is actively progressing on several of them. It is probable the unfinished foundations will be completed, and the masonry raised above high water by the month of September, and several of the piers be carried up by the close of the season to their full height, ready to receive the arches." While these sheets are passing through the press, an examination of the whole line * of aqueduct has been made with most satisfactory, results ; the water was stopped off be-