It was to remove these difficulties in some measure, that the formation of a navigable canal between the Friths of Forth and Clyde, had long been in agitation; and in the year 1767, the measure was brought forward in the House of Commons. This canal, upon a voyage from the Forth to the Clyde, is calculated to save no less than about 628 miles; the distance, by the inland navigation being reduced to about 35 miles. This work having been carried into execution, was opened from sea to sea in 1790, forming an important step in the progressive intercourse by water-carriage, a system which has since been so remarkably extended to all parts of the united kingdom. But the usefulness of the Forth and Clyde Canal was greatly marred by an unfortunate error in its construction, its depth having been limited to 9 feet, and its consequent incapacity for carrying _sea-borne_ ships of large burden; so that the inconveniences of a circuitous voyage round Scotland still remains for all the larger classes of shipping. In the formation of the Caledonian Canal, the error of the Forth and Clyde navigation has been avoided; this noble work being capable of receiving ships which draw 21 feet of water. [Sidenote: Voyage of James V. in 1540.] Notwithstanding these great improvements, it was still found necessary, from the increasing state of trade, to give further facilities to the navigation of the northern shores, by the Orkney and Western Islands. The first step taken towards this object, was to procure accurate surveys of the coast; for it is a curious fact, deserving of notice, that the little journal and chart of the enterprising voyage of James V., with many of the Scottish Nobles, from the Firth of Forth to the Solway Firth , by the Orkneys, was long consulted as the only guide for these seas. This voyage, so honourable to the naval annals of Scotland, was undertaken by James with twelve ships in the year 1540, under the direction of Alexander Lindsay, the most skilful pilot of his time. [Sidenote: Original Charts.]