would be proper to attribute to the whole body of water in the Aqueduct ; but the depth of water in the Aqueduct will be probably 4 feet as soon as it is brought into general use, and then there will be a corresponding increase in the velocity of the body of water. This velocity of a mile and a half an hour may be taken in general terms as the velocity of the water in the Aqueduct,

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DESCRIPTION OF THE LINE OF AQUEDUCT.

The dam, built to form the Fountain Reservoir, is about six miles above the mouth of the Croton River. The reservoir forms a beautiful sheet of water in the lap of the hills in the wild region of the Croton, and has received the name

of the " Croton Lake." Pine's Bridge over the Croton River, which is mentioned in the early history of the country, occupied a position which

is now about the middle of this Reservoir, and there is at that place a bridge over the Reservoir resting upon piers and

abutments. The hills which bound the Croton Valley where the Reservoir is formed are so bold as to confine it within narrow limits : for about two miles above the dam the average width

is about one eighth of a mile ; at this distance from the dam

the valley opens so that for the length of two miles more the width is about a quarter of a mile ; here the valley contracts again and diminishes the width until the flow line reaches the natural width of the River at the head of the lake. The country immediately contiguous to the shore has been cleared up, and all that would be liable to impart any impurity to the water has been removed.