RECAPITULATION

Of Real Estate belonging to the City of New-York, with the valuation thereof, and the Revenues derived therefrom, as submitted to the City Convention in the year 1846, by John Ewen, Esq., then City Comptroller.

COMPTROLLER'S PAY DAYS.

The following table will show when to present bills to the Comptroller for payment, and pay days in 1850.

CROTON AQUEDUCT.

The Compiler is indebted to the President of the Croton Board and the Commissioner of said Board, for the following interesting statements in relation to the Croton Aqueduct, &c. :

The following Map, showing the sources and course of the Croton River, is copied from "Schramke's Description of the New-York Croton Aqueduct."

At the point where the Aqueduct receives the water at the Dam, the elevation of the bottom of the water-way is 153 feet above mean-tide in the Hudson river, and the top-water line in the Distributing Reservoir at Forty-Secondstreet is 115 feet.

This great elevation is a remarkable feature in the peculiar adaptation of the Croton River to the purposes to which science and art have subjected it, but it is not the only one; the Department, in their Report to the Common Council, made on the 31st of December last, say, that "having its sources in many secluded lakes, and copious springs situated in a mountainous, and comparatively unfrequented region, intersected by numerous valleys, dark ravines, and steep declivities, resting upon a geological formation consisting principally of gneiss rock, the soil can never support other than a scattered agricultural and pastoral population; thus assuring us that in all time to come it will continue to pour forth its crystal waters in undiminished volume and purity. These lakes are readily sus ceptible, at a small outlay, of being converted into natural reservoirs, and furnish the means of accumulating thousands of millions of gallons of water, to be used as the exigencies of coming centuries may require."

The Croton River, its Formation and Sources.

The Croton River, which supplies the City of New-York with an inexhaustible stream of pure water, rises in Putnam County, the springs at the head of which form three branches known as the East, Middle and West Branches of the Croton; the first of which has its supply increased by the overflow of creans, stones, and peach ponds, the superficial areas of which are about five hundred acres; the middle branch is supplied almost solely by the spring at its source, while the western concentrates the surplus from White's Barrel's, Brown's, Cole's, Lockland, Court House, Crosby and Crane's Ponds, the united area of which is about eight hundred and seventy acres. These branches unite their supply a little south of Owentown, near the boundary line between Putnam and Westchester Counties, forming the Croton River, which, at Mechanicsville, receives by Cross and Beaver Dam rivers the overflow supplies from Long Pond, four miles north of Bedford, and which has an area of eight hundred acres. About a mile below Mechanicsville the Croton is further reinforced by the Muscoot River, with the supplies of Lake Mahopac, Kirk, Berry and Yorktown Ponds, the united areas of which is estimated at fifteen hundred acres. The supply is therefore from natural formned lakes covering a surface of over thirty-six hundred acres, each of which may be made into store-houses or reservoirs, for an additional supply in time of need. The supplies to these ponds and branches is almost exclusively from the elevated land of Westchester and Putnam Counties, furnished by pure springs, which are characteristic of granite formations, surrounded by cleared upland shores,