Cartwright, Esq., a civil engineer, residing at the village of Sing Sing, and who possesses much local knowledge of the Croton and its vicinity, to run levels on both sides of said river, starting from Garretson's mill, at aheight of thirty-eight feet, and carrying his levels up until they loose themselves at the surface of the water, in order to ascertain what quantity of land would be overflowed with water by the erection of a high dam at the aforesaid station.

The next subject which claimed the attention of the Commissioners was the duty imposed upon them by the Ordinance of the Common Council, passed the 24th of July, " the 1834, which requires them to specify in their report probable supply of water that can be obtained within the county." The Commissioners have presumed that this provision of the Ordinance has no allusion to the water that may be obtained by deep boring in the rock, or from the sinking of wells, as that subject was thoroughly examined by them in their report of 1833 and ;

they have had no reason, since that period, to change the opinion then formed. They have understood, however, an idea has been entertained by some of the members of the Common Council, that a large quantity of water may be obtained from springs originating in the high lands near Harlem and Manhattanville. It was no doubt this opinion which, in 1826, induced the application to the Legislature, by several of our citizens, for an act of incorporation. This act was passed on the 18th of April. 1826, and is entitled "An act to incorporate the New- York and Harlem Spring Water Company." Anson G. Phelps and James Renwick, Esquires, and their associates, are declared a body corporate for the purpose of supplying the city of New- York with pure and wholesome water.