This great work was opened, with appropriate ceremonies, and a splendid civic festival, on the 14th of October, 1842. The British consul, in accepting the invitation of the Common Council, to assist at this festival, justly remarked, "Tyrants have left monuments which call for admiration, but no similar work of a free people, for magnitude and utility, equals this great enterprise." Public feeling was very warm on this occasion. Of the procession of the trades, &c., which was three hours passing a given point, an enthusiastic citizen declared in print, that he "watched and scrutinized it closely, and could discover neither a drunkard nor a fool from first to last." It might be a difficult matter to decide on the moral and intellectual condition of the individuals composing such a procession, but we may concede that drunkards and fools are not the persons most likely to join in rejoicing for the introduction of pure water without stint or measure. The great Aqueduct is forty-one miles in length, commencing with a dam across the Croton river, six miles above its mouth. This raises the water one hundred and sixty-six feet above tide level, forming a lake or reservoir of four hundred acres in extent, containing five hundred million gallons, above the level that would allow the Aqueduct to discharge thirty-five million gallons per day. From the Croton Dam to Harlem River, something less than thirty-three miles, the Aqueduct is an uninterrupted conduit of hydraulic masonry, of stone and brick; the greatest interior width, seven feet five inches; the greatest height, eight feet five inches; the floor an inverted arch. The commissioners and chief engineers passed through its whole length on foot, as soon as it was completed; and, when the water was admitted, traversed it again in a boat built for the purpose. It crosses the Harlem River by a bridge of stone, fourteen hundred and fifty feet long, and one hundred and fourteen feet above high-water mark. At the Receiving Reservoir forty miles from the Dam, the masonry gives place to iron pipes, through which the water is conveyed two miles further, to the distributing reservoir, from which point it runs, by means of several hundred miles of pipes, to every corner of the city. On the line of the Aqueduct are one hundred and fourteen culverts, and sixteen tunnels, and ventilators occur at the distance of one mile apart throughout the route. The Receiving Reservoir covers thirty-five acres, and contains one hundred and fifty million imperial gallons. The Distributing Reservoir has walls forty-nine feet in height, and contains twenty million gallons. The supply to each citizen is at present almost unlimited, and afforded at a very moderate annual rate. The managers complain to the Common Council of the enormous waste during the summer, when "sixty imperial gallons each twenty-four hours to every inhabitant," are delivered. But even at this enormous