It appears from his report annexed, that the quantity of saline matter, probably the salts of lime and magnesia, does not exceed two and eight-tenths grains in the gallon a quantity, he observes, so small, that a considerable quantity of the water would ;

be necessary to determine the proportions. About two grains of vegetable matter were also suspended in the water, in consequence of the rapid current in which it was taken up, and which would of course subside in the receiving reservoir."

The Report next proceeds to speak of the Bronx, and of the capabilities of, and objections to, that source of supply.

The lower line taking the water from the Bronx near the mouth of the stream, so as to leave Underhill's Mill and the valuable cotton factory at Tuckahoe, untouched, would reach the bank of the Harlem river at 50 feet above tide. But it being- required to

deliver the water in the receiving reservoir at 123 feet above tide, reliance must be had on the power of the Harlem to raise it 73 feet. Upon calculating this power, however, itwas found incapable of raising more than 5,000,000 gallons daily, and as this would leave a deficit, even for present purposes when the work should be finished, of two or three millions of gallons a day, it was thought unnecessary to pursue the examination of that route.

Another line commencing at Popham's Calico Factory, was carefully surveyed. By rebuilding and raising the dam, a head of 142 feet above tide would be obtained, and no serious obstacles occur in the route before intersecting those laid out for the Croton. But upon guaging the streams of supply, it was at once perceived that no reliance could be placed upon a sufficient quantity from them.