1. The era of waterways, designed at once to facilitate the transport of heavy traffic from inland centres to the seaboard, and to supersede the then existing systems of locomotion—the wagon and the pack-horse. This era commenced with the construction of the Bridgwater Canal between 1766 and 1770, and terminated with the installation of the railway system in 1830. 2. The era of interoceanic canals, which was inaugurated by the completion of the Suez Canal in 1869, and is still in progress. 3. The era of ship-canals intended to afford to cities and towns remote from the sea, all the advantages of a seaboard, and especially that of removing and despatching merchandise without the necessity of breaking bulk. The second great stage in the development of canal transport is of comparatively recent origin. It may, in fact, be said to date only from the time when the construction of a canal across the Isthmus of Suez was proved to be not only practicable as an engineering project, but likewise highly successful as a commercial enterprise. Not that this was by any means the first canal of its kind. On the contrary, as we have shown elsewhere, the ancients had many schemes of a similar kind in view across the same isthmus. The canal of Languedoc, constructed in the reign of Louis XIV., was for that day as considerable an undertaking. It was designed for the purpose of affording a safe and speedy means of communication between the Mediterranean and the Atlantic Ocean; it has a total length of 148 miles, is in its highest part 600 ft. above the level of the sea, and has in all 114 locks and sluices. In Russia, canals had been constructed in the time of Peter the Great, for the purpose of affording a means of communication between the different inland seas that are characteristic of that country. The junction of the North and Caspian Seas, of the Baltic and the Caspian, and the union of the Black and the Caspian Seas, had all been assisted by the construction of a series of canals which were perhaps without parallel for their completeness a century ago. In Prussia a vast system of inland navigation had been completed during the last century, whereby Hamburg was connected with Dantzic, and the products of the country could be exported either by the Black Sea or by the Baltic. In Scotland the Forth and Clyde Canal, and the Caledonian Canal, were notable examples of artificial navigation designed to connect two seas, or two firths that had all the characteristics of independent oceans; and the Erie Canal, in the United States, completed a chain of communication between inland seas of much the same order.