considerations of economy induced them to build the work only high enough to comply with the requirements of the law. The plan which has been adopted for building an Aqueduct bridge across this valley is as follows : on the south shore of the river there is one arch of 50 feet span, across the river there are eight arches, each of 80 feet span, and on the north shore there are six arches each of 50 feet span making a range of fifteen arches. From the extremes of

this range of arches, a foundation wall of dry stone work connects with the Aqueduct. Two of the piers in the river have a rock foundation and the foundations for those where rock is not obtained is

formed by driving piles which are placed 2|- feet from centre to centre, and the spaces between filled with concrete to a depth of 3 feet below the top of them. Plate XIX. is a view of this bridge, which, when completed, will be the most interesting work on the whole line of Aqueduct, and in its appearance will rival the grandeur of similar works of the Ancient Romans. The height from the foundations in the river, to the top of the work is 150 feet ; the width across the top is 21 feet. The pipes when laid upon the bridge will be covered with earth to protect them from frost. The distance between the extremes of the pipes when laid across the bridge will be 1377-g- feet. For a distance of 18 feet at each end of the pipes there is an inclination and the remainder of the distance across, which is