Having thus brought our narrative of the progress of the work to its conclusion, it remains to present, as promised, a connected view of the aqueduct, its chief and most striking constructions, its general plan, and such other details as are likely to interest our readers.

We are permitted by Mr. Jervis to avail ourselves, for this purpose, of the description published by him on occasion of the civic celebration of the 14th of October, to which he enables us to add some further particulars of the state of the work, up to the

instant of passing these sheets through the press :

* I've raised A monument more durable than brass, Which, not the wasting storm nor blast all impotent Shall e'er o'erthrow, nor yet innumerable Successive years, nor flight of time.

MEMOIR OF THE

DESCRIPTION OF THE CROTON AdUEDUCT BY J. B. JERVIS, GENERAL DESCRIPTION OF THE LINE.

The Croton Aqueduct was designed to supply the city of New York with an abundance of pure and wholesome water. It commences about six miles above the mouth of the Croton river, where a dam has been constructed to elevate the water of the river 40 feet, to the level of the head of the aqueduct, or 166 feet above mean tide. The course of the aqueduct passes along the valley of the Croton to near its mouth, and thence passes into the valley of the Hudson. At 8 miles from the Croton dam, it reaches the village of Sing Sing, and continues south through the villages of Tarrytown, Dobbs' Ferry, Hastings, and Yonkers. At the latter place, it leaves the bank of the Hudson, crosses the valleys of Sawmill river and Tibbits' brook, thence along the side of the ridge that bounds the southerly side of Tibbits' brook valley, to within 34 miles of the Harlem river, where the high grounds of the Hudson fall away so much as to require the aqueduct to occupy the summit of the country lying between the Hudson and East rivers.