They are about 20 feet wide on the top, and increase in thickness towards the base by a slope on both sides : the outside face of the Reservoir bank has a slope of 1 foot horizontal to 3 feet vertical : the inside has a slope of li foot horizontal to 1 foot vertical. The outside face is protected by a stone wall 4 feet thick having the face laid in mortar : the inside face is protected by a slope wall of stone laid without mortar, If foot thick. The top of the bank is 4 feet above top water line, and the inside slope wall terminates at 2 feet above top water line, leaving the remainder of the face to be covered

with grass, so as to present a belt of green above the water on the bank entirely around the Reservoir. A neat fence bounds the outside and the inside of the top bank, forming a walk of a mile in length around the entire Reservoir. The greatest depth of water in the northern division is 20 feet was originally intended to excavate so as to give the : it

water a depth of 20 feet over the whole, but a quantity of rock was left, as the capacity was thought to be sufficient without taking it out. The southern division has 30 feet of water where the bottom was filled in with embankment, and 25 where excavation was made. A portion of rock was left in this division for the same reason as that in the northern division ; the greater part of it being in the south-west corner, where it