Various designs were presented, by Mr. Telford, for the adoption of the committee, from amongst which a suspension bridge was selected. This species of structure is now very generally preferred chiefly where centering is attended with difficulty and expense; but it is by no means a modern invention. It has long been known to the eastern countries: a Jihoola, or suspension bridge, was found amongst the inhabitants of the Himalä vales, on the river Touse, in the East Indies, by Mr. Frazer; and an ingenious and well executed work of this description made of bide-ropes, was discovered by Captain Hall, on the river Maypo in South America. The magnitude of the Mænai Bridge, and the boldness of the design render it still the most interesting and wonderful work of the kind in existence; and, although the bridge of Avignon possesses a span of fire hundred feet, and is also a truly admirable work, yet it is still inferior in the breadth of the principal span, the height above the water-level, and is constructed in a situation where there existed little difficulty in placing each bar, pin, and bolt, in their allotted berths. The Mænai Bridge consists of one principal opening, the breadth of which, between the centres the supporting pyramids, is five hundred and sixty feet, in addition to which spacious waterway there are four arches of stone on the Anglesea site, and three on the Caernarvon, to complete the communication, each having a span of fifty feet, with a springing line sixty-five feet above the level of high water, spring tides. The whole breadth, of the channel, or rather length of the bridge, amounts to eight hundred and eighty feet, and the roadway is elevated one hundred feet above the surface of high water. The sea-end of each series of arches is terminated by a pyramid, rising fifty feet above the level of the roadway; over the summits of these pass sixteen supporting chains, from which a horizontal roadway is suspended by vertical iron rods, linked at their lower extremities with the sleepers of the roadway. The whole breadth of the roadway is divided into two carriage tracks, each twelve feet broad, and a footpath of four feet in breadth, in the intermediate space, each protected by guards ten inches in height and six in thickness. The carriage ways pass through arches constructed in the supporting pyramids, and, to prevent the possibility of a collision of vehicles, are continued separate to the land extremities of each series of arches.