Steam communication between England and America had thus been demonstrated as possible beyond a doubt, and others were not slow to make the venture. The Great Western Company themselves determined to lay down a second ship; and it having been quickly seen that the mails must be henceforth carried by steam, a gentleman from Halifax, Nova Scotia, appeared upon the scene, who was destined to connect his name indelibly with the history of steam upon the Atlantic. This was Mr. Samuel Cunard, who had nursed the idea of such a steam line for some years, and who now, with Mr. George Burns, of Glasgow, and Mr. David McIver, of Liverpool, founded the great company known by Mr. Cunard’s name. The establishment of this line and the building of the Great Britain by the Great Western Company are two most notable events in steam navigation the one putting the steam traffic between the two countries on a firm and secure basis; the other marking a notable step in the revolution in construction and means of applying the propelling power, destined before many years to be completely accepted to the exclusion of the wooden hull and the paddle-wheel. It is not fair to speak of the use of iron in the Great Britain for the hull, in a general way, as the beginning of the change; she was only the first large ship to be built of this material. The credit of the introduction of iron is largely to be awarded to Mr. John Laird, of Birkenhead, who in 1829 built a lighter 60 feet long, 13 feet 4 inches in breadth, and 6 feet depth of hold; and in 1833, a paddle-wheel steamer, the Lady Lansdowne, of 148 tons, 133 feet long, 17 feet broad and 9 feet 6 inches deep. “In the following year Mr. Laird constructed a second paddle-steamer, for G. B. Lamar, Esq., of Savannah, United States, called the John Randolph. This was the first iron vessel ever seen in American waters. She was shipped in pieces at Liverpool, and riveted together in the Savannah River, where for several years afterward she was used as a tug-boat.” Though Mr. Laird was the ablest upholder of iron as a material for ship-building, and was the largest builder in it, the idea existed before him—Richard Trevithick and Robert Stevenson so early as 1809 proposing iron vessels, “and even suggested ‘masts, yards, and spars to be constructed in plates, with telescope-joints or screwed together; and in 1815 Mr. Dickenson patented an invention for vessels, or rather boats, to be built of iron, with a hollow water-tight gunwale” (Lindsay, vol. iv., p. 85). But nothing came of these proposals, and the first iron vessel mentioned was built in 1818 by Thomas Wilson, near Glasgow—the first steam vessel being the Aaron Manby, “constructed in 1821 at Horsley” (Lindsay). “Up to 1834, Mr. Laird had constructed six iron vessels altogether;” the largest of these was the Garryowen, of 300 tons, for the City of Dublin Steam Packet Company. Others of considerable size by the same builder